Using Payment Predictor method Full Payment OA creation

Hi Team,

We want full payment OA application in the Lockbox deposits, Which can be achieve by payment predictor process when only customer reference information is provided on payment worksheet selection page.

Payment predictor creates OA item but reason is not populated on payment worksheet application page.

Also incase of partial OA where payment amount>sum(item balance amount) reason is populated for OA item.

Kindly suggest how to populate reason incase of full OA application?

PFA document for setup and sample transaction we performed.