When swiping the CMB credit card, the POS machine displays the inquiry about the issuing bank, indicating that there is an error in the transaction of the issuing bank or the center.

The specific reasons are:

1. The card issuer or UnionPay Center does not allow this transaction.

2. The credit card is frozen or the credit card limit is insufficient.

3. The number of consecutive password errors exceeds the limit.

4. The card swiping method is incorrect or the magnetic stripe of the bank card is damaged.

5. Incorrect telephone line connection or faulty communication line.