The configurations should meet all of the following conditions:

• The API (Application Programming Interface) name of the custom field in the Consent_Type_vod object starts with zvod_Consent_
  
• A corresponding field with the name after zvod_ is created on the Multichannel_Consent_vod object
• The custom field is placed on the corresponding page layout of the Consent_Type_vod object
• The end-user has Field-Level Security (FLS) to the custom field  

Related Documentation:

CRM Help Documentation:

• Consent Capture Overview
• Creating Consent Types