I my case I could fix it by implementing a new type, actual just replacing the constructor:

public BigIntegerType() {
super( NumericTypeDescriptor.INSTANCE, BigIntegerTypeDescriptor.INSTANCE );
}

But I have manually change the column type in the database before. The length and precision field of the column can be used for the correct SQL type extraction to do it automatically. If not specified an exception could be thrown while generation the DDL.