P17714 WO Status Update issue

For a specific WO Order Type & WO Type, when the status is changed, it writes to the Status history file and in the Application appears to update the WO Status (e.g. 20 > 40) but when you do a find again or select the WO, status is still at the old status, even though there is a record written to the F1307 for the new status.

No other WO Order Types or WO Types manifest this behaviour.

Has anyone seen this before? A search of bugs has come up with nothing.