Amanda Wong explains How to Edit Posted Payables Transactions in GP 2010
How to Edit Posted Payables Transactions in GP 2010 | onza blog
Payables & ReceivablesTips & Hidden FeaturesMicrosoft & the GP EcosystemGP 2010
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.