Where do I look to see what caused code Z* to show up on Form 1065 Schedule K1 line 20?

I've got partner losses and no special credit allocations but the Z* code shows up in line 20 and references a STMT but without a statement number.

I'm directed to screen 20.1 (credits) but there are no credits and there is nothing to edit in screen 20.1; it is blank because I don't have any fuel credits, other credits or credits for holders of bonds.).

Thanks,

CB