Approval Preview not displayed in Shopping cart

Hi,

On creating shopping carts through Plan Driven procurement, we are changing the cart status from the default "Ordered/Approved" to "Awaiting approval". The approvers are displayed in BBP_PD for this Shopping Cart, however the same is not visible in SRM portal.

We have also refreshed all the templates, but the Approval tab and Overview link, is not displayed in shopping cart.

We are on SRM 5.0, 5.5 server, Extended Classic scenario with SP 17 and have implemented N-step approval work flow BADI to determine approvers based on the cost center entered in shopping cart.

Kindly provide inputs to have approvers displayed in SRM portal.

Thanks,

KB