Portal Theme not coming in - Page Header Area

Hello Experts,

We are facing the issue that the Portal Theme colour is not coming in the Page Header Area . The Page Header area is coming from the FPM_OVP_COMPONENT. I am attaching the screen shot of the same.

We are doing our development in ECC Ehp6 and netweaver portal version is 7.31.

The Portal Theme is working in the Page Content area corretly.

I have set the WDFORCEEXTERNALSTYLESHEET = X in the application parameter.

Please let know if anyone has face such issue and how its fixed.

Thanks

Amol