feat: uom in update items for SO & PO (#22869)

* feat: uom in update items for SO & PO

* fix: supplied items doesn't updates on uom change

* chore: add uom and conv factor change test

* fix: test

* fix: purchase order updates are not tracked

* fix: fetch conversion factor on uom change

* fix: codacy

Co-authored-by: Marica <maricadsouza221197@gmail.com>
diff --git a/erpnext/public/js/utils.js b/erpnext/public/js/utils.js
index bcab0d8..87982f1 100755
--- a/erpnext/public/js/utils.js
+++ b/erpnext/public/js/utils.js
@@ -467,6 +467,33 @@
 		disabled: 0,
 		label: __('Item Code')
 	}, {
+		fieldtype:'Link',
+		fieldname:'uom',
+		options: 'UOM',
+		read_only: 0,
+		label: __('UOM'),
+		reqd: 1,
+		onchange: function () {
+			frappe.call({
+				method: "erpnext.stock.get_item_details.get_conversion_factor",
+				args: { item_code: this.doc.item_code, uom: this.value },
+				callback: r => {
+					if(!r.exc) {
+						if (this.doc.conversion_factor == r.message.conversion_factor) return;
+						
+						const docname = this.doc.docname;
+						dialog.fields_dict.trans_items.df.data.some(doc => {
+							if (doc.docname == docname) {
+								doc.conversion_factor = r.message.conversion_factor;
+								dialog.fields_dict.trans_items.grid.refresh();
+								return true;
+							}
+						})
+					}
+				}
+			});
+		}
+	}, {
 		fieldtype:'Float',
 		fieldname:"qty",
 		default: 0,
@@ -546,6 +573,7 @@
 			"conversion_factor": d.conversion_factor,
 			"qty": d.qty,
 			"rate": d.rate,
+			"uom": d.uom
 		});
 		this.data = dialog.fields_dict.trans_items.df.data;
 		dialog.fields_dict.trans_items.grid.refresh();