Well, I mentioned that the BTE makes sense if you wish to implement additional checks that are not available in standard, but for your specific case this will not solve the real problem, you will just use the budget without getting good results in return.
The note, which I mentioned, 325551 - Field check and field texts in condition tables, provides very good instructions how you can add additional checks.
In your case, I suspect that (if there is no additional development done to prevent that), after you add the distribution channel to the access sequence, you will get the message Material &1 not defined for sales organization &2 with dist. channel &3 (VK007).