Master data access problem

Hi All

I have a master data object ..it is a z object where it has customer as the key and the attributes are salesoffice, sales dist and sales group.

I am using this master data object in one of my req where in the transaction data i get only the customer and from there i am pulling the sales office,sales dist and sales group from this master data object using the option READ MASTER DATA at the transformation level in the Rule details.

The problem is that i am able to get the data for all the customer's except 5 customers but when i get in to the master data and check the sales off, sales dist and region is maintained there, but still it is not picking only for those 5 customers and for rest of the customers it is working fine..

so i thought i should be some master data problem and i deleted that master data using delete master data option with out sid's and reloaded it again and after that i reloaded the transaction data back..but still it is having the same problem but at the object level the data is there...

Can any one suggest me as to wat would the problem can be?

Please i appreciate your quick repaonses.

Regards

Shilpa