Before Command hook

Use this hook to perform additional actions before the custom form command is executed. This hook can use actual values of the form fields. You can cancel the execution of the command by calling the choice.again() function. If multiple records can have been selected to be processed.

Example:

function extern function.publish.before.command()
{
|* Publishing only for manufactured items
        if tcibd001.kitm <> tckitm.manufacture then
                choice.again()
        endif
}