It is because of the item check in OVA8. Am sure you must have checked this
Please read the F1 help of the field "item check". It says if item generates warning message as a result of credit check system generates warning only for the first line item . However, system shows you the warning message again at the time of saving the sales document which including by considering the 2nd line item also.
When the system is not displaying the warning message to the 2nd line item don't think that system is not performing credit check for the 2nd line item as i said in the above it is because of Item check functionality.
Item check is used to when the user is entering the line item wise items system automatically gives either warning/error message once the document values reaches the Payer customer given credit limit so then user will stop entering the next line item. Since system is not giving warning message that does not mean user can go ahead with entering the remaining items also. No, system definitely considers the next line items also subject to you checked credit active field in VOV7 for those line items item categories.
thanks,
Srinu.
