Errors and corrections can be made by addressing concerns with CBP, but CBP does not always make the desired correction. It would be important to know the reason that your father gave to the Consulate for coming to the US, whether his DS160 and information provided at Port of Entry, past immigration history is, and future plans are, prior to considering whether making the correction is needed. Generally, B1/B2 is issued for visa purposes and the CBP chooses the classification based on what the applicant for admission states.
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