GST - Document Sequencing not generated for AR Transaction

GST - Document Sequence number is not generated after running the 'India - Invoice Number Generation' program for the specific AR Transaction.

I had defined a sequence for AR Transaction category 2 weeks back for which a sequence was created and the same was seen in the India - Tax Details form.

One strange observation was that the same Sequence number was given to 2 consecutive manual transactions in AR.

But now, no sequence is being generated at all.

Only changes I have done after that is:

-define the more sequences for other locations with the same organization

- assign the same sequence to Sales Order category