The support chat suggested action worked for me!

"Open your company file in single-user mode with the sysadmin user. Go to Setup / Setup Users. Enter the sysadmin password. Take a screenshot of the user’s setup screen (because you will have to recreate these users). One by one, select each user and click Remove User, except the sysadmin. When only the sysadmin user is left, select it and click Modify User. Remove the sysadmin password: enter a character in the Enter Password box, press the Backspace key, and click OK. Recreate the usernames and passwords for all users. Add the email addresses if this is a file shared with RDA"

The step that says to remove the sysadmin password... the system wouldn't allow me to do this. I only have one employee, so it was quick and easy to remove and recreate one user, and that worked for me, I am able to create inventory items again!

The support chat suggested action worked for me!

"Open your company file in single-user mode with the sysadmin user. Go to Setup / Setup Users. Enter the sysadmin password. Take a screenshot of the user’s setup screen (because you will have to recreate these users). One by one, select each user and click Remove User, except the sysadmin. When only the sysadmin user is left, select it and click Modify User. Remove the sysadmin password: enter a character in the Enter Password box, press the Backspace key, and click OK. Recreate the usernames and passwords for all users. Add the email addresses if this is a file shared with RDA"

The step that says to remove the sysadmin password... the system wouldn't allow me to do this. I only have one employee, so it was quick and easy to remove and recreate one user, and that worked for me, I am able to create inventory items again!