I’m sure there is some impact, but precisely what/how/when...well, it’s just a cleanup activity that you likely expect to have...
ARM can be confusing, even for some CPAs because there’s system accounting involved beyond just debits/credits. First step is to assess where you’re at...hope you have a sandbox.
1. The ARM config should be assessed.
2. The population of data to all the records>fields required for your configuration needs validated. Starts at the item or rev rec rules depending on your preference of how you want to view the world...
Grab an ARM experienced consultant and you’ll get there much faster.
If you just can’t do that...theres a manual.