Did you post just a sample? Because here you have a typo in USE command.

Could it be that your SP produces an error, which is not shown? Are you sure your SP has full rights? You may need to add SHARED keyword in USE command, since you may not know all environment settings.

>No error message. The code in Stored Procedure is very simple:
>
>

>user ("DataFolder" + "mytable") in 0 alias MYTABLE
>append blank in MYTABLE
>replace myfield with "ABC" in MYTABLE
>

>
>But no record gets inserted to the MYTABLE.
>