Enhancement option not shown in Mopz .... Totally confused ):

Dear experts,

I want to upgrade 2 servers:

1. SAP ERP 6.0 -

TO----- SAP ERP 6.0 EHP4 / NW 7.01

2. SAP ERP 6.0 EHP4 / NW 7.01 -

TO----- SAP ERP 6.0 EHP5

To accomplish the above mentioned task i need XML files which are generated by solution manager Maintenance Optimizer. We have Solution Manager 7.0 EHP 1 with SPS28. I have successfully add my systems using SMSY with product ERP 6.0. When i created a maintenance transaction then after selecting the systems (Product ERP 6.0), choosing Calculate Files Automatically - Recommended, then on next screen it is only showing me the option maintenance.

I have read several forums and everybody guide to add system with Product ERP 6.0. I have done the same but i am very very confused why Enhancemnt Option is not appearing. Please help and give your expert opinion in resolving this issue. I am very thankful for your help.

Thanks,

Yasir