Can You Have Different Service Provider BUs for Procurement and AP?

Summary:

Is it possible to have different BU service providers for the Procurement and AP functions?

Content (please ensure you mask any confidential information):

Context :

• Multiple Requisitioning BUs (only requisitioning and receiving) spread across multiple Primary Ledgers - REQ BU 1, REQ BU 2, under PL 1 and REQ BU 3 under PL 2.
• One single Procurement BU defined as a service provider for the Requisitioning BUs (only Procurement and Contracts functions) - PRC BU
• Two Main BUs that would have to process the Invoices for the previous BUs, also across multiple Ledgers - MAIN BU 1 under PL 1 and MAIN BU 2 under PL 2.

Basically, PR is raised in REQ BU 1, PO is process via PRC BU and Invoice is processed through MAIN BU 1, without generating intercompany.