Give option for custom fields that are relationships to other Aha! record to be single select

Currently the custom fields that are relationships to other Aha! records (e.g., workspace field) allow users to choose one or more workspaces. In many of our use cases, we need to limit the choice to one and only one record. In such situations, giving the user the option to select multiple creates many data quality issues that we have to deal with later, so it would be great when creating such fields, in the custom field definition screen to give the option to allow for either one or multiple selects.