Why am I getting an error from Web Services saying "User must be logged in to use order management!"?

This error usually means that Power Pick has lost the web services session. This can sometimes happen if Power Pick was upgraded. 

Try this Simple Potential Fix 

In Power Pick > Cross Enterprise Unit Parameters > 03 Web Services Enabled

• Change this setting to FALSE and save.
• Change the setting back to TRUE and save.

Confirm Credentials

If that workaround does not resolve the issue, double-check that the Power Pick user credentials entered in ItemPath are correct (Settings > Kardex > Power Pick Web Services Connection).

Restart the Power Pick Cross Enterprise Unit Service

If the issue is still unresolved, the Power Pick Cross Enterprise Unit Service should be restarted from the list of Windows Services.

Alternatively, you can use a command to stop and start the Power Pick Cross Enterprise Unit Service. 

Batch file to stop service (filename.bat):

net stop PowerPick.CrossEnterpriseUnit

Batch file to start service (filename.bat):

net start PowerPick.CrossEnterpriseUnit

If you're having issues with the service stopping, you can use CMD file to kill task (filename.cmd):

taskkill /IM "GP.CrossEnterpriseUnit.exe" /F
pause