When sending a service invoice, we show the deduction of retention on the invoice which goes to a different nominal code to allow us to control the amount outstanding for retentions held.
I have just tried to create this but sage will not allow it "CIS reverse charge tax codes can't be used on invoices or credits which use negative lines".
Considering CIS reverse charge and retentions deducted are both something only relative to construction, you would think that Sage would have come up with a solution, not problems. Is this something that is going to be resolved? the only solution currently is to create a separate credit which is not practical.
Very Annoyed 
