GRINYA is one of the more complex issues in ERP Finance. GRINYA is the tracking via ledger account of the value of items received on a purchase order that have not been matched to a supplier invoice.
Baan solutions for Baan IV and V were incomplete. To take full advantage of the current GRINYA reconciliation process, check Infor solution #107147, which contains the GRINYA user manual and a link to download the software for your version of Baan. For ERP LN, look at Document Code U8942C US.
It is called User Guide for Reconciliation and Analysis. If you are not running the latest GRINYA solutions, patching will require a good amount of time in filling the Interim tables this solution runs from. Infor has posted several procedural write ups, so check the Support Site and read up before tackling this for the first time.