Contract Creation displays error when adding lines

Summary:

We are trying to add a 'Sell' intent contract without projects. On trying to add lines we are getting errors with following codes:

OKC: 195496

OKC: 195325

Content (required):

Contract Creation:

The contract overview page is as follows:

Billing page is as follows:

Create Line

On entering Type and searching for name and keeping the same blank, I am getting this error:

How to resolve this error? Is there a user guide or demo content which can guide on how to create a non project service contract for sale of services?

Thanks

Atul

Version (include the version you are using, if applicable):