We are having a similar problem.  We have a number of contractors who need T4A's for their services. These same vendors sometime incur expenses for which they are reimbursed; these are not fees for services, and shouldn't be included in the T4A.

We are not about to create new vendor accounts for these individuals when we reimburse expenses, but the inability to enter a negative adjustment means we can't correct the T4A's, and have to go through the manual filing process.

Any help would be welcome.