Segregation of roles: authorization object/activity

Hello,

This question might sound basic to many of the user of this forum, but I would like to obtain a clear answer from a trusted source

In the following example:

Role A: Transaction code FB50 - Authorization object F_BKPF_BUK T001 - Activity 'Park'

Role B: Transaction code FB50 - Authorization object F_BKPF_BUK T002 - Activity 'Park', 'Post'.

A user is granted with roles A and B. Question: will SAP merge the activities making the user able to post on company code 'T001' or not?

I apologize again if the answer seems to be obvious.

Thanks in advance,

Eli