Hi Nipurn,
Standard SAP allows entry multiple times. There is a reason behind this. Lets say material X is required in operation 10 and operation 50. Now at the time of component assignment in routing if you maintain the material once, you can not assign it in two operations. Component qty can not be split. But if you maintain two places, you can assign.
If you really want use EXIT_SAPLOMCV_001 or EXIT_SAPLOMCV_002
.
Regards,
Krishnendu.