Inspection lot

Hi

We have a issue recurring inspection lot created before

we have material and we have maintained inspection type Z01 in material master that origin is 01 for Pre-sampling Inspection and also maintained inspection type 09 for Recurring inspection of batches and maintained Inspection interval 5 days.

system has created lot against inspection type Z01 on date 01/01/2011 and has created Recurring inspection lot on date 02/01/2011

base on above scenario system should be Recurring inspection lot on date 05/01/2011 during batch job run .

why system has created Recurring inspection lot 02.01.2011 intend of 05.01.2011

and what i need to be checked