What are all privileges required for Existing Time Cards Redwood UI to work

We enabled red wood ui for Worker Time card Entries. Every thing is working fine but from "Existing Time Cards" when user clicking on Add "+" button it is giving error "Error response during RestAction". We are using custom role and we can't use seeded Employee role (because all employees will not use timecards and it is consuming license even not used). There might be some privilege missing in custom role but we are not able to find any document on this. Appreciate any help or suggestions

Thanks