How to resolve "Customer and Company cannot have different Currency?"
- When associating a Contact to a Company, both must use the same currency.
- If the currency you select while creating the Contact doesn't match the Company's currency, the system throws this error: "Customer and Company cannot have different Currency."

To resolve the error:
- When creating a Contact, check the currency used by the Company you want to link it to.
- Set the same currency for the Contact.
- Associate the Company with the Contact.

The currency cannot be changed after the record is created.