Hi,
MIGO is a single screen transaction for all goods movements. Whatever you are doing in MB1A can be done in MIGO also. If you dont have any reference document, you can choose the reference document as "other" in MIGO and enter the details along with the movement type. Please note that there can be different field selection in MIGO.
Also, SAP has decided to make the MB1* transactions as obsolete and these transactions wont be available from next release of SAP.
If you are not able to do the goods movement in MIGO, revert back with the error message / issue.
Regards,
AKPT