Generate Number Seq

User CustGroupId as an example,
add code to class: NumberSeqModuleCustomer
    datatype.parmDatatypeId(extendedTypeNum(CustGroupId));
    datatype.parmReferenceHelp("Customer group ID");
    datatype.parmWizardIsContinuous(false);
    datatype.parmWizardIsManual(NoYes::No);
    datatype.parmWizardIsChangeDownAllowed(NoYes::Yes);
    datatype.parmWizardIsChangeUpAllowed(NoYes::Yes);
    datatype.parmWizardHighest(999);
    datatype.parmSortField(20);
    datatype.addParameterType(NumberSeqParameterType::DataArea, true, false);
    this.create(datatype);

Locate Table: CustParameters, add a new method to this table.
public server static NumberSequenceReference numRefCustGroupId()
{
    return NumberSeqReference::findReference(
    extendedTypeNum(CustGroupId));
}
To Test the sequence generated, create a job as the following:
static void number(Args _args)
{
    NumberSeq  numberSeq;
    CarId num;
    ;
    numberSeq = NumberSeq::newGetNum(CustParameters::numRefCustGroupId());
    num = numberSeq.num();
    info(num);
}