10000742 
Message
Quantity defined causes inventory to fall below defined minimum; in "Quantity", enter valid value
Diagnosis
In a sales or purchasing document, on the Contents tab, in the Quantity column, you have entered a quantity that is greater than the available quantity for that item.
Procedure
In the Quantity column, decrease the amount to be less than or equal to the available inventory.
Note
To view the defined minimum quantity of an item:
Open the Item Master Data window and navigate to the item whose minimum quantity you want to view.
Choose the Inventory Data tab. The minimum quantity is specified in the Inventory Level Minimum field.
To view the available inventory quantity of an item:
Open the Item Master Data window and navigate to the item whose available quantity you want to view.
Choose the Inventory Data tab. The available quantity is specified in the Available column.