What kind of entities you can use while creating BPF?
Entities that can use business process flows in Dynamics 365
Only entities that use the updated forms can use business process flows. This includes custom entities and the following system entities:
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Account
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Appointment
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Campaign
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Campaign Activity
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Campaign Response
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Competitor
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Contact
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Email
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Entitlement
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Fax
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Case
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Invoice
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Lead
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Letter
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Marketing List
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Opportunity
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Phone Call
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Product
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Price List Item
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Quote
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Recurring Appointment
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Sales Literature
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Social Activity
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Order
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User
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Task
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Team
To enable a custom entity for business process flows, select the Business process flows (fields will be created)check box in the entity definition. Note that you can’t undo this action.
Note
If you navigate to the business process flow stage that contains the Social Activity entity and choose the Next Stage button, you’ll see the Create option. When you choose Create, the Social Activity form loads. However, because Social Activity isn’t valid for Create from the Dynamics 365 application user interface, you won’t be able to save the form and you’ll see the error message: “Unexpected error.”
I hope this helps..