Anna,
thanks yes I have picked up many things from the posts, but tough to tell whether some still apply since we are on HRSP 75, 10.0D Level 30 already which should leave the last 4 OSS notes (in theory) you mentioned and we have applied those...(although I am now going to go back and double check the program code to be sure changes are there)
The run of RPUPAYUS_SYNC_TAX_DATA with the taxes produces an output on screen which seems to indicate T5UTT changes are being added as expected, but checking the actual table contents of T5UTT shows no additions at all...double checked to make sure and it is running in Prod mode but still nothing:
General messages just shows the error for tax type '00' not being inserted which I wouldn't expect to fail the rest...I am running in foreground but wouldnt expect that should matter either?