Error says incompatible data types. Fields must be same data type to link. If PrimaryID is a number type in one table but the other field is a text type, they can't link.
Does this data have 1-to-1 relationship?
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As June7 said, Fields must be same data type to link, Text-to-Text, Number-to-Number, etc. The only (sort of) exception is if one of the Fields is an Autonumber. If PrimaryID is defined as an Autonumber, the linking Field must be defined as a Number (not an Autonumber) with the Field Size set to Long Integer.
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