I've added a custom attribute to the customer account i Magento. It's a multiselect attribute. When I export customers to cvs via dataprofiles the attribute is present in the CSV with ids separated by commas i.e "13,14". When I try to import customers with the multiselect attribute Magento gives me following error:
File is totally invalid. Please fix errors and re-upload file Checked rows: 1, checked entities: 1, invalid rows: 1, total errors: 1
The error relates to the column with my custom attribute.
How do i remedy this error?