fix: clarify error message for child tables

frappe/model/document.py

@@ -1725,8 +1725,16 @@ class Document(BaseDocument, DocRef):
 			return
 
 		if date_diff(to_date, from_date) < 0:
+			table_row = ""
+			if self.meta.istable:
+				table_row = _("{0} row #{1}: ").format(
+					_(frappe.unscrub(self.parentfield)),
+					self.idx,
+				)
+
 			frappe.throw(
-				_("{0} must be after {1}").format(
+				table_row
+				+ _("{0} must be after {1}").format(
 					frappe.bold(_(self.meta.get_label(to_date_field))),
 					frappe.bold(_(self.meta.get_label(from_date_field))),
 				),