10001227 
Message
Enter a whole number for purchasing and sales unit of serial item
Diagnosis
In the Item Master Data window, you have defined an item to be managed by serial numbers. You have entered a number that is not a whole number in one of the following:
On the Purchasing Data tab, in the Items per Purchase Unit field
On the Sales Data tab, in the Items per Sales Unit field
Procedure
Enter a whole number in one of the following:
On the Purchasing Data tab, in the Items per Purchase Unit field
On the Sales Data tab, in the Items per Sales Unit field