The general trade quota is negative, and the foreign exchange bureau cannot modify it for you, because all the data are automatically generated by the system. The reason why the general trade quota is negative is that the quota is used together. You used the general trade line in advance, and the only remedy is to cross the line back. First, clear out the total amount of the cross-used quota, and then settle the same amount of normal exports with the advance payment quota. Remember, only the same amount of credit can be reversed.