Hi Greg,
I would suggest to add "min" validation rule or define a custom one - for more information you can check this article.
Also about the template error - in current case I would suggest to add additional logic to the template where if the "vendorID" is null to return empty template. Additionally you can define "default" value for current field in the dataSource schema definition.
I would suggest to add "min" validation rule or define a custom one - for more information you can check this article.
Also about the template error - in current case I would suggest to add additional logic to the template where if the "vendorID" is null to return empty template. Additionally you can define "default" value for current field in the dataSource schema definition.