Item arrival registration

Hi,

After creating a purchase order of qty = 50 and try to register and post partially through Arrival overview and item journal, i found the following:

When doing registration from item arrival for qty = 20, post item arrival and trying to post product receipt for registered quantity, i found that AX give 9 serials only (out of 50)?!!

any idea?

kindly note that version is AX 2012 R3 CU12

Regards