Using ROP , OPC C or B to reorder discretely

The objective is to use IM reorder report, with items OPC B and or C to
order discretely.  MRP is not used.

The goal is to re-order an item only when there is an allocation driving the
on-hand balance negative.  The closest I have been able to come with MAPICS
settings, is to set the OPC code to C and the Fixed Order Quantity to .001.
When the on-hand balance goes negative, the reorder reports calculates a
re-order quantity of the value of the negative on-hand balance +.001.

The questions:  Is there something I am missing? Is there a way to configure
items using OPC B or C to reorder the exact quantity of the negative
balance?  Is there a third party product which will do discrete re-ordering?
Does someone have code modifications for MAPICS ROP logic.

In advance, thanks

Mike Dreimiller
Mandis-Inc@xxxxxxx