Hi,
You can follow below steps to map your process
A. Create a material type ZCUS( a copy of ROH material type ), have quantity and value update indicator in t.code:OMS2 and create your customer material ( MCM) with material type ZCUS in t.code: MM01
B. Check your Customer Number with t.code: XD03
C. Create a Dummy Vendor in t.code XK01 and assign your Customer Number in field of Customer in Account Control segment in Control View of vendor master
Now if needed by you and your business, create a purchase order (ME21N) to Dummy Vendor( which is your customer) with free indicate and receive material with MIGO Movement type 511
OR else go for MM consignment process with activating consignment info record and have consignment info record maintained. Now Create consignment purchase order with item category K for customer material ( MCM) and go for Goods Receipt in MIGO wrt consignment purchase order. As required by you and by your business, can consume material ( MCM) with MB1A t.code with movement type 411K and whenever needed can track customer material ( MCM) stock in t.code: MB54
Regards,
Biju K