a.how to calculate the WIP is for Material in REM
b. whether wip material is same HALB
In addition to master data of REM - materials, BOM, Workcenters, Routing/rate routings, Production Version, Product cost collector, you must have Reporting Point to have WIP.
You can give reporting Reporting Points in Routing / Rate routing will Mile stone confirmation at that point.
While backflushing, at every reporting point there will be confirmation and will have WIP.
To check WIP - transaction code is MF26.
Pl. try this.
In REM, cost object is product cost collector, in production order process production order itself is a cost object and WIP is calculated for the order itself.
In REM WIP has to be calculated for the cost collector, cost collectors can individually be processed by KKAS and collectively by KKAO (select the option with product cost collector and deselct production and process order option).
Reward if useful.