No null values in the Quantity committed in store level

Hi, I have just started having this problem in two of our shops and I was wandering if anyone else has had the same problem. It is an error concerning the 401 worksheet. There is a timeout followed by this message.
Error-2147217873 – Cannot insert the value Null into column "Quantitycommitted…”, .
There are no null values in the Quantity committed in store level & itemdynamic in HQ
