OOPS, looks like I messed up.

This will walk you through it though, if you are using Access.
Otherwise, you can email me the db and I will fix it.

To do it yourself,
Make a backup copy
start the program.
In the top right corner, you will see two close boxes, the one with the "X" in them, the top one closes Access and the bottom one close the form. We want to close the form. Click the bottom X

You now see a bunch of "TABS" that say things such as Tables, queries, forms, etc.

Click on the Tab "Tables"

Click once on the table named ArchiveNameList so that it is highlighed.
Click on the button "Design"

Click on the gray box to the left of the name "SASSNumber", an arrow will appear in the box

towards the bottom of the screen, you will see some setting under a tab called "general"
There is a setting called Indexed that is set to "Yes (No Duplicates)" Click in this setting and a down arrow will appear. click the down arrow and then choose "Yes(Duplicates OK)"

Click the word "File" at the top left of the screen and then click close. You will be asked if you want to save your changes. Click "YES"

Now close access by clicking the X in the top right corner.

Now you can start the program and it should work.

Alan