Document Tolerance

Hello,

We are on 9.1.

Does anyone know the difference between the document tolerance process that you can run from the purchasing module vs the process that you can run out of the Account Payble module?

1) Purchasing>Purchase Orders>Verify Document Tolerance (FS_DOC_TOL)

2) Accounts Payable>Batch Processes>Vouchers>Document Tolerance (FS_DOC_TOL)

They both run the FS_DOC_TOL app engine and they both allow you to choose either a document type of "Voucher" or Purchase Order".

Are they doing the same thing?  If you choose one document type, does that mean the other is excluded?

Peoplebooks did not seem to have much detail on this.