During our implementation we came to know that when we reverse/Cancel Posted Purchase invoice with Credit Memo Accounting entry get reversed but TDS is not reversed. which we need to do it through TDS adjustment journal.
As TDS is Statutory part of Indian Government, where any sort of manual adjustment, will need justification during external audits.
The way GST is reversed in Business Central during Credit Memo posting, similar way TDS should also get reversed. Both are part of statutory requirement.