When adding Multi-Instance Keyword Type Groups to a form during form design, only one instance of a Multi-Instance Keyword Type Group can be placed in the same repeater section or table in the Designer. Additional instances of a Multi-Instance Keyword Type Group are added in the Client when data is entered into a form.
When adding Keyword Types that belong to a Single Instance Keyword Type Group to a form in the Designer, only one instance of these types of Keyword Types can be added to a form.
Note:
It is best practice to always add Keyword Types that are not in a Multi-Instance Keyword Type Group to a Workflow form's Document Type as standalone keywords and not as part of a Single-Instance Keyword Type Group.