Is it possible to have a lookup in Requisition Approval

Summary: Is it possible to have a lookup in requisition approval in if condition in BPM, expectation is to have a lookup having 1800 combinations of supplier and Requester and corresponding approval amount. 

Content (required): Could you please confirm if we can leverage decision table to support out requirement of having a lookup in BPM Approval  to have a lookup having 1800 combinations of supplier and Requester and corresponding approval amount. When the requester available on the lookup is creating a requisition for the supplier available in lookup the approval amount on the lookup (Table ) should be compared with the requisition amount