ORA_MAIN work definition internal name for item isn't valid.

Summary:

Process manufacturing Work Order isn't getting created from Planning; however, it can be done manually. The error which system shows in SCO is

'The work order wasn't created because the provided ORA_MAIN work definition internal name for item XYZ isn't valid. You must provide a valid work definition internal name.'

Content (please ensure you mask any confidential information):

Manually, process manufacturing Work Orders can be created for the product. The product does have a formula. When we are trying to release Work Order from planning, the error is observed.

We are using 'Main' in work definition, which is seeded one and it will be planning enabled by default.