Calling Bsp1 to Bsp2

I am fairly new to Bsp's.

I am developing BSP Objects in CRM through WEB requests. I have a scenario in which i have to Branch from one BSP1 to Another BSP2 and then After Completion of BSP2 the Control goes back to BSP1.

I am able to Naviagte Between BSP's Statelessly without any hassle but once i make the BSP1 page Stateful from where I am branching i get an error

"Object requested is currently locked by user ANONYMOUS ".

I even Want to Save the Data that has been already been entered by the APPLICANT on the BSP1 when i am comin Back from Second BSP2.

Any relevant Feedback would be helpful.