I think this was me.
I was originally reviewed by the CRA on the wording of my SA agreement, where by the word "offset" was used and they denied my eligible dependent credit. I had my lawyer re-draft my SA agreement to remove the offset language and make separate payments. Ex agrees to sign, then her lawyer tells her not to and I waste 2k on lawyer fees.
However, at the same time, I was in process of responding and making an appeal to the CRA. Throughout the process, I consulted my lawyer on how to respond to the CRA and review my appeal letter. I categorized this as legal fees in responding to the CRA.
In the end, the CRA reversed their decision and allowed the credit with the original wording in my SA. Even though it used "set-off", the key to my appeal was "each party has a legal obligation to pay the other support" was in my original SA. (I would recommend not using "set-off" anywhere in a SA, just lots of red flags for the CRA to review you)
A year later, the CRA reviews my legal fees. They ask for invoices and I provide. All my invoices had a description of the work done. (ie review of CRA letter, Eligible dependent consult, review of CRA response). I had asked my lawyer to ensure she wrote CRA on every invoice. They allowed my legal fees.
I hope that helps.