Correcting a pension deposit error

[Sixpack]

I have a case where the contribution to satisfy MRC in a pension plan was deposited in error to the clients profit sharing plan. We can't seem to agree on how to correct it. EPRSC doesn't seem to cover it. The MF deadline has passed (9-13-19) and the deposit was made timely but to the wrong plan. It seems the deposit to the PSP should be transferred directly to the pension plan and recorded as the MFC, but we don't see any guidance to support this approach. Alternatively to return the contribution to the corp then pay it over to the DB but then would it be considered late.  If anyone has dealt with the problem, what is the proper correction?