Can the subsidiary on IH transactions be flexed in (ETO) if project accounting is turned on for the

This is an ETO/Job Cost manufacturing environment, We are trying to flex the cost code on the IH labor transaction based on a user reference field stored on the F3112 - Work order routing, instead of using the SUB from the work order. As a given work order may cross multiple departments and each department is a separate cost code on our Job Cost COA.

It seems like the only way this will work is if we turn off project accounting (31P/AI) for the 3120 DMAAI. Not sure what other repercussions would some from turning that off, both for our own facility, let alone other facilities we have that are using ETO and Job Cost.