fix(stock): allow partial raw material picking/transfer from work order

When creating a pick list for a work order with partially available stock,
the resulting Material Transfer for Manufacture stock entry was setting
fg_completed_qty = for_qty (= wo.qty), causing material_transferred_for_manufacturing
to reach wo.qty after just one partial transfer and blocking further pick lists.

Fix:
- Set fg_completed_qty = 0 on stock entries created from pick lists so the
  old SUM(fg_completed_qty) path never fires prematurely
- Recompute material_transferred_for_manufacturing after each transfer:
  use SUM(fg_completed_qty) when > 0 (direct entries / excess transfer),
  otherwise use min(transferred/required) × wo.qty (pick list flow)
- Add _validate_no_excess_transfer for pick list entries (fg_completed_qty=0)
  to prevent transferring more than pending qty; skip for return entries
  and when backflush is based on Material Transferred for Manufacture
- Remove the zero-qty prompt in pick list work_order trigger; skip the
  qty dialog in work_order.js when max transferable qty is already 0
- Hide fg_completed_qty field in Stock Entry for Material Transfer for
  Manufacture purpose since it is unused in that flow

Fixes: #70713, #63846

erpnext/manufacturing/doctype/work_order/services/required_items.py

@@ -19,6 +19,7 @@ from erpnext.manufacturing.doctype.work_order.services.reservation import (
 	get_consumed_qty,
 	get_row_wise_serial_batch,
 )
+from erpnext.manufacturing.doctype.work_order.services.status import StatusService
 from erpnext.stock.utils import get_bin, get_latest_stock_qty
 
 
@@ -146,6 +147,38 @@ class RequiredItemsService:
 					row, transferred_qty, row_wise_serial_batch
 				)
 
+		self.recompute_material_transferred_for_manufacturing(transferred_items)
+
+	def recompute_material_transferred_for_manufacturing(self, transferred_items):
+		"""Set material_transferred_for_manufacturing based on actual item-level transfers, not fg_completed_qty."""
+		# When fg_completed_qty > 0 (direct stock entries, excess transfer), preserve the
+		# SUM(fg_completed_qty) approach so excess-transfer tracking works correctly.
+		sum_fg_completed_qty = StatusService(self.doc).get_transferred_or_manufactured_qty(
+			"Material Transfer for Manufacture", "material_transferred_for_manufacturing"
+		)
+		if sum_fg_completed_qty:
+			self.doc.db_set("material_transferred_for_manufacturing", sum_fg_completed_qty)
+			return
+
+		# Pick list flow sets fg_completed_qty=0; use min-fraction of actual item transfers
+		# so partial availability does not prematurely mark the work order as fully transferred.
+		required_by_item = {}
+		for row in self.doc.required_items:
+			if not row.include_item_in_manufacturing or flt(row.required_qty) <= 0:
+				continue
+			required_by_item[row.item_code] = required_by_item.get(row.item_code, 0.0) + flt(row.required_qty)
+
+		if not required_by_item:
+			return
+
+		min_fraction = min(
+			flt(transferred_items.get(item_code) or 0) / required_qty
+			for item_code, required_qty in required_by_item.items()
+		)
+		min_fraction = min(min_fraction, 1.0)
+		material_transferred = min_fraction * flt(self.doc.qty)
+		self.doc.db_set("material_transferred_for_manufacturing", material_transferred)
+
 	def update_returned_qty(self):
 		returned_dict = self._material_transfer_qty_by_item(is_return=1)
 		for row in self.doc.required_items:

erpnext/manufacturing/doctype/work_order/work_order.js

@@ -1149,17 +1149,24 @@ erpnext.work_order = {
 	},
 
 	create_pick_list: function (frm, purpose = "Material Transfer for Manufacture") {
-		this.show_prompt_for_qty_input(frm, purpose)
-			.then((data) => {
-				return frappe.xcall("erpnext.manufacturing.doctype.work_order.mapper.create_pick_list", {
+		const max = this.get_max_transferable_qty(frm, purpose);
+
+		const get_pick_list = (for_qty) =>
+			frappe
+				.xcall("erpnext.manufacturing.doctype.work_order.mapper.create_pick_list", {
 					source_name: frm.doc.name,
-					for_qty: data.qty,
+					for_qty: for_qty,
+				})
+				.then((pick_list) => {
+					frappe.model.sync(pick_list);
+					frappe.set_route("Form", pick_list.doctype, pick_list.name);
 				});
-			})
-			.then((pick_list) => {
-				frappe.model.sync(pick_list);
-				frappe.set_route("Form", pick_list.doctype, pick_list.name);
-			});
+
+		if (max <= 0) {
+			get_pick_list(frm.doc.qty);
+		} else {
+			this.show_prompt_for_qty_input(frm, purpose).then((data) => get_pick_list(data.qty));
+		}
 	},
 
 	make_consumption_se: function (frm, backflush_raw_materials_based_on) {

erpnext/stock/doctype/pick_list/mapper.py

@@ -353,7 +353,7 @@ def update_stock_entry_based_on_work_order(pick_list, stock_entry):
 	stock_entry.from_bom = 1
 	stock_entry.bom_no = work_order.bom_no
 	stock_entry.use_multi_level_bom = work_order.use_multi_level_bom
-	stock_entry.fg_completed_qty = pick_list.for_qty
+	stock_entry.fg_completed_qty = 0
 	if work_order.bom_no:
 		stock_entry.inspection_required = frappe.db.get_value("BOM", work_order.bom_no, "inspection_required")
 

erpnext/stock/doctype/stock_entry/services/material_transfer.py

@@ -182,13 +182,66 @@ class MaterialTransferForManufactureStockEntry(BaseMaterialTransferStockEntry):
 		self.validate_same_source_target_warehouse()
 
 	def validate_component_and_quantities(self):
-		if not frappe.db.get_single_value("Manufacturing Settings", "validate_components_quantities_per_bom"):
+		if self.doc.fg_completed_qty:
+			if frappe.db.get_single_value("Manufacturing Settings", "validate_components_quantities_per_bom"):
+				_check_bom_component_qty(
+					self.doc, get_bom_items(self.doc.bom_no, self.doc.use_multi_level_bom)
+				)
+		elif self.doc.work_order:
+			self._validate_no_excess_transfer()
+
+	def _validate_no_excess_transfer(self):
+		if self.doc.is_return:
 			return
 
-		if not self.doc.fg_completed_qty:
+		if (
+			frappe.db.get_single_value("Manufacturing Settings", "backflush_raw_materials_based_on")
+			== "Material Transferred for Manufacture"
+		):
 			return
 
-		_check_bom_component_qty(self.doc, get_bom_items(self.doc.bom_no, self.doc.use_multi_level_bom))
+		wo = self.wo_doc
+		if not wo:
+			return
+
+		pending_by_item = {}
+		for r in wo.required_items:
+			pending_by_item[r.item_code] = (
+				pending_by_item.get(r.item_code, 0.0) + flt(r.required_qty) - flt(r.transferred_qty)
+			)
+
+		transfer_by_item = {}
+		first_row_by_item = {}
+		for item in self.doc.items:
+			if not item.s_warehouse:
+				continue
+
+			key = (
+				item.item_code if item.item_code in pending_by_item else getattr(item, "original_item", None)
+			)
+			if key not in pending_by_item:
+				continue
+
+			transfer_by_item[key] = transfer_by_item.get(key, 0.0) + flt(item.qty)
+			first_row_by_item.setdefault(key, item)
+
+		for key, transfer_qty in transfer_by_item.items():
+			pending_qty = pending_by_item[key]
+			if transfer_qty > pending_qty:
+				item = first_row_by_item[key]
+				frappe.throw(
+					_(
+						"Row #{0}: Cannot transfer {1} {2} of Item {3}. "
+						"Maximum transferable quantity is {4} {2}."
+					).format(
+						item.idx,
+						transfer_qty,
+						item.uom,
+						frappe.bold(item.item_code),
+						pending_qty,
+					),
+					title=_("Excess Material Transfer"),
+				)
 
 	def add_items(self):
 		item_dict = self.get_pending_raw_materials()