One completed & filed a 1st Qtr Form 941-SS (for American Samoa,Guam, etc).
Should have used Form 941. Now the choices seem to be:
a) do nothing,
b) Prepare a 941-X (note there was no overreporting or underreporting, everything is correct, just wrong form),
c) File a 941 and a 941-X
Showing on the 941-X a series of overreported original amounts all reduced to zero
d) ???
Thanks!