Use some different masking mechanism instead of the predefined operator.
To achieve this please do the following:
- Click on the “Manage” button in Masks category of the Home tab
- In the “Manage masks” window make sure the “Substitution” radio button is selected
- Click on the “New” button
- In the “Create substitution mask” window, once name of the mask is provided along with the other desired parameters, from the Type drop-down list choose desired masking mechanism, apart from the “Predefined”
Waiting for fix in future release of ApexSQL Mask