Stack.xml file isn't generated

Hi guys,

I'm trying update my SAR ERP 6.0 EHP 4 /NW 7.0 EHP1 to the last SPS (26 for ERP, 16 for EHP4) using sap solution manager  (SAP EHP 1 for SAP Solution Manager 7.0) and the stack.xml isn't generated. I start the transaction solution_manager, change management, maintenance optimizer and create new transaction maintenance. After that, I select  my system, choose for Calculate Files Automatically - Recommended, select maintenance as update option and select the sps 16 for SAP ERP EHP 4 on NW7.01 - SP Stack 16 as target. All files are put in the download basket but the stack.xml isn't generated at EPS\in folder. What is going on?

Best Regards,

Cícero.