Locks problems with STS

Hi,

I am working with BPS into BI 7.0, and its STS. The user goes to the STS web page and takes a node A and changes its status to "In process" and its brother node B is "Send to approval".

The node A is locked; the message said "An exclusive lock was set in subplan AA planning session BB for the transaction data. For this reason, you can only display the data. ... In the case Botton up ( it is my case), set automatically when a subplan was send for approval or was approval, but the node is "in process" and that node has only one planning folder.

Thanks for your help.

Victoria