A weird thing in changing UDF setting

Hi All,

I had a weird thing in UDF setting. Previously I set some valid values for an UDF, now I removed them so there is no limitation for this UDF. At least I don't see any setting in valid values in UDF management tools. But the problem is when i test my add-on it gives me error like value is not valid value for this UDF. Do I need to reboot whole SAP B1 server?

Any idea?

Thanks,

Lan