feat: facilitate manual selection of PO row

eu_einvoice/european_e_invoice/doctype/e_invoice_import/e_invoice_import.js

@@ -37,6 +37,17 @@ frappe.ui.form.on("E Invoice Import", {
 			};
 		});
 
+		frm.set_query("po_detail", "items", function (doc, cdt, cdn) {
+			const row = locals[cdt][cdn];
+			return {
+				query: "eu_einvoice.european_e_invoice.doctype.e_invoice_import.e_invoice_import.po_item_query",
+				filters: {
+					parent: doc.purchase_order,
+					item_code: row.item,
+				},
+			};
+		});
+
 		frm.set_query("tax_account", "taxes", function (doc, cdt, cdn) {
 			return {
 				filters: {
@@ -109,4 +120,25 @@ frappe.ui.form.on("E Invoice Item", {
 			source_name: cdn,
 		});
 	},
+
+	po_detail: function (frm, cdt, cdn) {
+		const row = locals[cdt][cdn];
+		if (!row.po_detail || (row.item && row.uom) || !frappe.model.can_read("Purchase Order")) {
+			return;
+		}
+
+		frappe
+			.xcall(
+				"eu_einvoice.european_e_invoice.doctype.e_invoice_import.e_invoice_import.get_po_item_details",
+				{ po_detail: row.po_detail }
+			)
+			.then((r) => {
+				if (r.item_code && !row.item) {
+					frappe.model.set_value(cdt, cdn, "item", r.item_code);
+				}
+				if (r.uom && !row.uom) {
+					frappe.model.set_value(cdt, cdn, "uom", r.uom);
+				}
+			});
+	},
 });

eu_einvoice/european_e_invoice/doctype/e_invoice_import/e_invoice_import.py

@@ -551,3 +551,43 @@ def link_to_purchase_invoice(einvoice: str, purchase_invoice: str):
 		frappe.throw(_("E Invoice Import {0} does not exist").format(einvoice))
 
 	pi.db_set("e_invoice_import", einvoice)
+
+
+@frappe.whitelist()
+@frappe.validate_and_sanitize_search_inputs
+def po_item_query(doctype, txt, searchfield, start, page_len, filters, as_dict=False):
+	item_code = filters.pop("item_code")
+	purchase_order = filters.pop("parent")
+
+	if not purchase_order:
+		return []
+
+	purchase_order = frappe.get_doc("Purchase Order", purchase_order)
+	purchase_order.check_permission("read")
+
+	return [
+		[
+			row.name,
+			_("Row {0}").format(row.idx),
+			row.item_code,
+			row.description[:100] + "..." if len(row.description) > 40 else row.description,
+			row.get_formatted("qty") + " " + row.uom,
+			row.get_formatted("net_rate") + " / " + row.uom,
+		]
+		for row in purchase_order.items
+		if not item_code or row.item_code == item_code
+	]
+
+
+@frappe.whitelist()
+def get_po_item_details(po_detail: str):
+	purchase_order_name = frappe.db.get_value("Purchase Order Item", po_detail, "parent")
+	purchase_order = frappe.get_doc("Purchase Order", purchase_order_name)
+	if not purchase_order.has_permission("read"):
+		return {}
+
+	row = purchase_order.getone("items", {"name": po_detail})
+	return {
+		"item_code": row.item_code,
+		"uom": row.uom,
+	}