New cost center is not updating in IT 0001

Hi Experts,

Need your valuable input in the following issue.

User has uploaded the newly created COST center, which is effective from 01.08.2015 & delimited the old cost center to 31.07.2015.

But this new cost center are not updated in IT 0001, even though it was successfully uploaded in OM.

But if the user manually creating the link between position &  cost center through PO13, then IT0001 is updated with the new cost center which is effective from 01.08.2015.

Can any one please let me know what could be the possible reason for this inconsistency in OM & PA & how can we resolve this.

Thanks & Regards,

Prashanti Swain