Customer is special composite type which is not available for custom
entities in CRM 3. You will need to add two separete lookup fields for
account and contact.
uMar Khan :: MS CRM MVP
CRM Freelance Consultant
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> The customerid field is used in opportunity and case and it allows you
> to select an account or contact, Great.
> I want to create this field in a form for a new entity i have made,
> but i cant work out how.
> Please help.