Restrict the asset details to get saved
i created a custom field in metadata schema. This field have validation like starts with capital M,S and follow with numeric (ex:MS123 accepted Ms234 error).
This field is not a required fields. if the user don't input any data it should save. if the user input some data/text and the data not follows the patten then we need to restrict the user in saving the asset details.
Please help...