BW roles required for a BPC user to run process chain

Hi,

i'm trying to execute a BW process chain using "Trigger BW process chain BPC package" but it is failing for lack of authorization.

When i checked in SU53, it is giving tcode error PFCG which doesn't make any sense at all.

Does anyone know what BW roles need to be assigned to BPC user?

FYI:   i've a user with Z:SAP_ALL who can run BPC package with no issues.

also, BPC user who is having issues has all of the required BPC roles. (2 standard roles). so, i feel BW roles is an issue.