Repeated Error on Sales Transaction Entry: "Your previous transaction level posting section has not finished processing. Please allow time for it to finish......."

Hi All,

One of our GP user is repetitively experiencing an error in Sales Transaction Entry window.

The error is:

"Your previous transaction level posting section has not finished processing. Please allow time for it to finish.  If you believe it has failed, log out of Microsoft Dynamics GP and log back in to recover transactions."

She continued to experience this and cannot open the Sales Transaction Entry window again IF I will not run the script below:

SELECT*FROM SY00500 WHERE BACHNUMB ='';

SELECT*FROM SY00500 WHERE BACHNUMB ='rreyes';

If records are found, the script below should be run:

DELETE SY00500 WHERE BACHNUMB ='rreyes';

Why does this error keeps on returning after he posted some transactions?

Thanks in advance,

Rotchine