I think this message comes about when a collection has been locked. The only case I know of when this may occur, is when the mass-loader is used. If this is true and the mass-loader is inactive (for whatever reason) you can cancel the load with _admin=CancelMassLoad(“collection/doctype”).
If this is not the case then I am unsure what is causing the error. Maybe restart the db and see if this cures the problem.
#Tamino#API-Management#webMethods