Default Attribute list mandatory on Negotiation

Summary: For Negotiation, we are maintaining the list under 'Manage Attribute Lists' setup and when business creates a negotiation, so until user select the button 'add from list' on lines level these Attribute doesn't appear.

So, with 'Manage Default Line Attributes' option on negotiation, we can add the list to default and post which on line it'll be appear.

but incase if they didn't select these attributes, still they can proceed ahead for negotiation creation.

So as a Poke yoke or proactive way, User shouldn't miss on selecting how we can make this Attributes default either with negotiation style or any other ways. Please suggest.