From what I read, making changes is OK as long as long as:ok, this makes sense... as i believe if you are providing justification in LOE, which is genuine, I believe it should be OK...
thanks
- it doesn't affect (lower for sure, raise I'm unsure) your CRS score;
- you explain it in a LOE
- it doesn't create a conflict in your personal, work or travel histories (for instance changing the company name to exact legal entity on e-APR application forms and having a employment confirmation letter that is not updated with the same legal name, in case you prepared the letter in advance)
edit: in your case, have you updated your spouse personal history and make sure the time spent to study for Master Degree is reflected?