Delivery output not triggered for shipment completion

Hello experts,

I set up a variant in RV56ABST to PGI the deliveries upon completion of shipment. The deliveries are PGIing as expected, however the delivery output is not triggered (which is supposed to trigger after PGI), the output requirement routine for delivery output is 1 - Delivery GI posted.

It looks like some OSS note is missing. Please advise.

Thanks,
Satish