0HRPOSITION_ATTR

My data load for 0HRPOSITION_ATTR has come back with 5 errors and I cant see why.

One of the error states: The time interval ['20080428'/'20070401'] & (from/to) for the data

records 4700 & and 4703 & overlaps in characteristic 0HRPOSITION &.

Another states: The data record 4704 & with the key '50002481 &' for characteristic

0HRPOSITION & has the invalid time interval ['20080429'/'20080428'] &

(from/to).

Unless I change this in our ERP system I'm going to get this error every time I run this datasource but I cant see any data in the ERP system for the position it mentions where dates etc do overlap or are incorrect. I've been looking at PO13 but there just doesnt seem to be anything wrong.

Any ideas?