Hi Rorie,
Please check in OVZ9 for your checking group and checking rule "check without RLT" (Table field: T441V-OWBZP) is checked?
Please refer OSS note 547512 - FAQ: Customizing of the ATP in R/3
1. Question:
Why is an available quantity of 9,999,999,999 [units] displayed for all selected batches in batch determination?
Answer:
For an availability check that takes into account the replenishment lead time, any quantity can be confirmed after the replenishment lead time has expired. Since batches cannot be reproduced, the availability check must be carried out without taking account of the replenishment lead time in the case of materials to be handled in batches. This means that the "Check without RLT" indicator must be set in the "Replenishment lead time" field for the check.
Regards,
R.Brahmankar