fix: do not reset asset_category (#29696)

diff --git a/erpnext/stock/doctype/item/item.js b/erpnext/stock/doctype/item/item.js
index ffea9c2..9e8b3bd 100644
--- a/erpnext/stock/doctype/item/item.js
+++ b/erpnext/stock/doctype/item/item.js
@@ -165,21 +165,21 @@
 		frm.set_value('has_batch_no', 0);
 		frm.toggle_enable(['has_serial_no', 'serial_no_series'], !frm.doc.is_fixed_asset);
 
-		frm.call({
-			method: "set_asset_naming_series",
-			doc: frm.doc,
-			callback: function() {
+		frappe.call({
+			method: "erpnext.stock.doctype.item.item.get_asset_naming_series",
+			callback: function(r) {
 				frm.set_value("is_stock_item", frm.doc.is_fixed_asset ? 0 : 1);
-				frm.trigger("set_asset_naming_series");
+				frm.events.set_asset_naming_series(frm, r.message);
 			}
 		});
 
 		frm.trigger('auto_create_assets');
 	},
 
-	set_asset_naming_series: function(frm) {
-		if (frm.doc.__onload && frm.doc.__onload.asset_naming_series) {
-			frm.set_df_property("asset_naming_series", "options", frm.doc.__onload.asset_naming_series);
+	set_asset_naming_series: function(frm, asset_naming_series) {
+		if ((frm.doc.__onload && frm.doc.__onload.asset_naming_series) || asset_naming_series) {
+			let naming_series = (frm.doc.__onload && frm.doc.__onload.asset_naming_series) || asset_naming_series;
+			frm.set_df_property("asset_naming_series", "options", naming_series);
 		}
 	},
 
diff --git a/erpnext/stock/doctype/item/item.py b/erpnext/stock/doctype/item/item.py
index 494fb3b..32c72fd 100644
--- a/erpnext/stock/doctype/item/item.py
+++ b/erpnext/stock/doctype/item/item.py
@@ -50,15 +50,7 @@
 class Item(Document):
 	def onload(self):
 		self.set_onload('stock_exists', self.stock_ledger_created())
-		self.set_asset_naming_series()
-
-	@frappe.whitelist()
-	def set_asset_naming_series(self):
-		if not hasattr(self, '_asset_naming_series'):
-			from erpnext.assets.doctype.asset.asset import get_asset_naming_series
-			self._asset_naming_series = get_asset_naming_series()
-
-		self.set_onload('asset_naming_series', self._asset_naming_series)
+		self.set_onload('asset_naming_series', get_asset_naming_series())
 
 	def autoname(self):
 		if frappe.db.get_default("item_naming_by") == "Naming Series":
@@ -999,7 +991,7 @@
 	if uom == stock_uom:
 		return 1.0
 
-	from_uom, to_uom = uom, stock_uom   # renaming for readability
+	from_uom, to_uom = uom, stock_uom	# renaming for readability
 
 	exact_match = frappe.db.get_value("UOM Conversion Factor", {"to_uom": to_uom, "from_uom": from_uom}, ["value"], as_dict=1)
 	if exact_match:
@@ -1011,9 +1003,9 @@
 
 	# This attempts to try and get conversion from intermediate UOM.
 	# case:
-	#            g -> mg = 1000
-	#            g -> kg = 0.001
-	# therefore  kg -> mg = 1000  / 0.001 = 1,000,000
+	#			 g -> mg = 1000
+	#			 g -> kg = 0.001
+	# therefore	 kg -> mg = 1000  / 0.001 = 1,000,000
 	intermediate_match = frappe.db.sql("""
 			select (first.value / second.value) as value
 			from `tabUOM Conversion Factor` first
@@ -1072,3 +1064,11 @@
 							frappe.bold(item_default.company),
 							frappe.bold(frappe.unscrub(field))
 						), title=_("Invalid Item Defaults"))
+
+
+@frappe.whitelist()
+def get_asset_naming_series():
+	from erpnext.assets.doctype.asset.asset import get_asset_naming_series
+
+	return get_asset_naming_series()
+