Как достать Common из FormDataSource?

[raz]

PHP код:

server static CustAccount createOneTimeAccount(Common _common)
{
    NumberSeq           numberSeq;
    CustInvoiceTable    custInvoiceTable;
    SalesTable          salesTable;
    CustTable           custTable;
    ;

    if (!CustTable::createOneTimeAccountValidate())
        return '';

    ttsbegin;

    numberSeq = NumberSeq::newGetNum(CustParameters::numRefOneTimeCustomerAccount());

    custTable = CustTable::find(CustParameters::find().defaultCust);

    custTable.accountNum = numberSeq.num();

    switch (_common.tableId)
    {
        case  custInvoiceTable.tableId  :
            custTable.initFromCustInvoiceTable(_common);
            break;

        case  salesTable.tableId  :
            custTable.initFromSalesTable(_common);
            break;
.....