fix: better validation message with solution for BOM recursion (backport #47472) (#47476)

fix: better validation message with solution for BOM recursion

(cherry picked from commit 7103cdd84a)

Co-authored-by: Rohit Waghchaure <rohitw1991@gmail.com>

erpnext/manufacturing/doctype/bom/bom.py

@@ -7,7 +7,7 @@ from collections import deque
 from operator import itemgetter
 
 import frappe
-from frappe import _
+from frappe import _, bold
 from frappe.core.doctype.version.version import get_diff
 from frappe.model.mapper import get_mapped_doc
 from frappe.utils import cint, cstr, flt, today
@@ -554,9 +554,16 @@ class BOM(WebsiteGenerator):
 	def check_recursion(self, bom_list=None):
 		"""Check whether recursion occurs in any bom"""
 
-		def _throw_error(bom_name):
+		def _throw_error(bom_name, production_item=None):
+			msg = _("BOM recursion: {1} cannot be parent or child of {0}").format(self.name, bom_name)
+			if production_item and bom_name != self.name:
+				msg += "<br><br>"
+				msg += _(
+					"Note: If you want to use the finished good {0} as a raw material, then enable the 'Do Not Explode' checkbox in the Items table against the same raw material."
+				).format(bold(production_item))
+
 			frappe.throw(
-				_("BOM recursion: {1} cannot be parent or child of {0}").format(self.name, bom_name),
+				msg,
 				exc=BOMRecursionError,
 			)
 
@@ -573,7 +580,7 @@ class BOM(WebsiteGenerator):
 			if self.item == item.item_code and item.bom_no:
 				# Same item but with different BOM should not be allowed.
 				# Same item can appear recursively once as long as it doesn't have BOM.
-				_throw_error(item.bom_no)
+				_throw_error(item.bom_no, self.item)
 
 		if self.name in {d.bom_no for d in self.items}:
 			_throw_error(self.name)