Dear Durga Rao,
please first lets check some things.
- Are you able to call the the theme designer in the Portal? Do you see the link "UI Theme Designer" below Content Administration -> Portal Display -> Portal Themes ?
- Which Browser do you use? SAP recommends to use Chrome for the theme designer
- Which theme do you try to customize? not every theme is suitable for every Frameworkpage
- Is the Preview working fine? if you choose Tradeshow theme and the AJAX Portal Framework Page is everything loading fine? it should look like this:
The posted versions
SAP NetWeaver7.4 & Stack-7.
UI theme designer Version is 1.2.1
Engine Version 1.2.1
SAP UI5 Version 1.20.1
should work just fine as I have the same exact versions installed :-)
If everything works fine you shall find the save & build option in the upper left hand corner
Best Regards
Fabian