Unable to cancel/reverse invoice document

Hello,

We have an issue wherein we are unable to reverse an invoice document.

Details:
We created a service PO and posted GR via service entry sheet process.
While posting invoice via MIRO, the amount in basic data tab was entered as 0 (zero) and all amount was entered against unplanned delivery costs (details tab) and the document was posted.
Now, when we are trying to reverse this document via MR8M, we are getting error "you are not allowed to have zero lines only".

I know that this is happening because during reversal process, the system tried to generate FI document, it cannot do the same because there are no lines with >0 amount and hence it is giving this error.

Can anyone help on how to fix this issue? How can we reverse this document?

Thanks,

Ani.