000990 : <value> is already joined.
Description
The same table cannot be joined to the same layer more than once at any time.
Solution
Remove the joined table using the Remove Join tool, then rejoin the table using the Add Join tool.
3/4/2014
The same table cannot be joined to the same layer more than once at any time.
Remove the joined table using the Remove Join tool, then rejoin the table using the Add Join tool.