Recurring Billing Transaction generated with document number in incomplete status.

We have system option control for document number generation at complete level.

also, the Source and category has the control enabled to generate the transaction from recurring bill plan at incomplete status.

and, the Document sequence type is gapless.

Even though all the setup is intact and expecting the transaction should be generated without document number, but is the system is not behaving alike.

It is generating the document number in incomplete status.