Include Custom Fields
Whether or not to retrieve custom fields that are added to Acumatica Screens.
property IncludeCustomFields: Boolean;
Set this to true if you have custom fields added and have not extended the API to include custom fields in your entities.
Acumatica endpoints support a small amount of custom fields per request. Once a certain amount is reached, it is recommended to setup an extended endpoint and include the custom fields in it.