Issuing a credit memo against a zero value invoice

[mungoandmaud79]

We sometimes create a zero value sales transaction (for instance as a goodwill gesture).  If this transaction then needs to be returned, how can we process a zero value credit memo?  Thank you.   

[Tom Robertshaw]

What happens you try to issue a credit memo? Do you get a specific error?

[mungoandmaud79]

Dear Tom

Apologies - I did not see your reply.  

When the invoice is zero value, you simply don't see the option in Magento to create a credit memo.

Thank you!

[Tom Robertshaw]

Do you have the office for just cancelling the order instead?

[mungoandmaud79]

Dear Tom

That would mess up our integrations so we need to have some way of reversing the sale rather than cancelling it please.  Thank you.  

[Tom Robertshaw · Accepted solution]

If your integrations won't support it then you're only way is to customise Magento to allow it to create a credit memo for invoices of zero value. I doubt that there's a go to solution for this so it's going to be a cause of an investigation required from a Magento developer.