Number sequence - Use number sequence on custom form

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 Number sequence code for custom form

[Form]
public class Form1 extends FormRun 
{
    private NumberSeqFormHandler numberSeqFormHandler;

    public NumberSeqFormHandler numberSeqFormHandler()
    {
        if (!numberSeqFormHandler)
        {
            numberSeqFormHandler = numberSeqFormHandler::newForm(
                CustParameters::numRefCustAccount().NumberSequenceId,
                element,
                CustTable_ds,
                fieldNum(CustTable, AccountNum));
        }

        return numberSeqFormHandler;
    }

    void close()
    {
        if (numberSeqFormHandler)
        {
            numberSeqFormHandler.formMethodClose();
        }
            
        super();
    }

    [DataSource]
    class CustTable
    {
        public void create(boolean _append = false)
        {
            element.numberSeqFormHandler().formMethodDataSourceCreatePre();
            super(_append);
            element.numberSeqFormHandler().formMethodDataSourceCreate();
        }

        public void delete()
        {
            element.numberSeqFormHandler().formMethodDataSourceDelete();
            super();
        }

        public boolean validateWrite()
        {
            boolean ret;

            ret = super();
            ret = element.numberSeqFormHandler().formMethodDataSourceValidateWrite(ret) && ret;

            return ret;
        }

        public void write()
        {
            super();
            element.numberSeqFormHandler().formMethodDataSourceWrite();
        }

        public void linkActive()
        {
            element.numberSeqFormHandler().formMethodDataSourceLinkActive();
            super();
        }
    }

}