Need to add "MPA" Suffix to PO Number if user selected "Yes" for DFF Field on PO User Interface

Summary:

Need to add "MPA" Suffix to the PO Number if the user selected "Yes" for DFF Field on PO User Interface

Content (please ensure you mask any confidential information):

Hi Experts,

We need from system to enable the User while matching the PO to the AP Invoice that the PO is related to MultiPeriod Accounting "MPA" from the PO Number

By making the system add "MPA" suffix to the PO number if the Buyer selected "Yes" for a DFF field called Multiperiod accounting that we created on the PO page.

How please can make system add "MPA" to the PO number in that case? if we can't, what is the workaround for the same?