Update. In newer versions of Add-on (2018.x or higher, the Timestamp.ini file is now instead called VersionIdentifier.ini. In that file, you will instead of a timestamp find a GUID. Simple change a few chars in the GUId to trigger the reset all functionality)
B1 Usability Package
Go to Administration > Add-ons > B1 Usability Package > Help and troubleshooting > "Reset XML" button
- Go to %appdata%\Boyum IT\BOY_E0_MODIFICATIONS
- Remove the folder named "CachedData"
Q: Is it dangerous to reset Xml?
Q: Can I reset XML for All users?
A: Yes, instead go to the Add-on install folder (C:\Program Files (x86)\SAP\SAP Business One\AddOns\BOY\B1 Usability Package) and remove the file "VersionIdentifier.ini". Then start B1 Client as administrator to recreate the file (the new file will reset for all users the next time they log in)