Rebuildable WO for Serialized Rebuildable Item existing on Asset

Hi,

We have one Serialized Rebuildable Item RBITEM-007 existing on Asset Number A0027. In View Rebuildable Serial Numbers form, RBITEM-007 correctly shows up Parent Asset Number A0027 and Current Status as 'Issued out of stores'. We now have a scenario wherein Asset A0027 is taken for maintenance and requires to replace its child component RBITEM-007. But as there is no stock existing of RBITEM, we have to repair RBITEM-007 itself and fit it back in A0027. We tried creating a manual Rebuildable WO for RBITEM-007, but it asks for a Completion Subinventory at WO Completion. Since we want to fit back RB-ITEM-007