Do you have acccess to SSMS? If so, try these steps:
1) Select * from GL00100 and look for your GL accouint and make note of the ACTINDX value
2) Select * from GL10001 where ACTINDX = the value from Step 1 make note of the DEX_ROW_ID value(s)
3) Delete GL10001 where DEX_ROW_ID = the value(s) from Step 2
or
You may have orphaned records and running check links might clear up this issue. Make sure you have a backup before running check links or running the SQL commands.
