Auto PO Output for Blanket Releases

Hello all and happy new year,

My client is using 12.2.5, and I wanted to know if it's possible to automatically generate a PO Output Communication - as an attachment - to the Blanket Release's header, like it's being automatically generated and attached to the PO header.

Based on Doc ID 1612856.1, it should work for:

l_entity_name := 'PO_HEAD';

  l_entity_name :='PO_REL';

But I guess I'm missing a setup step.

Please advise.

Thanks,

Tom.