[murad]

Спасибо.
Делаю так:

ax.TTSBegin();
IAxaptaObject oDataSourceSales= (IAxaptaObject)oQuery.Call("AddDataSource", iSalesTableID , Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing);
				oDataSourceSales.Call("Update",true,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing);

IAxaptaObject oQueryRun = ax.CreateObject("QueryRun", oQuery,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing); 
oQueryRun.Call("UserUpdate", true,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing);								
while ((bool)oQueryRun.Call("Next",Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing))
				{
					IAxaptaRecord rec = (IAxaptaRecord)oQueryRun.Call("GetNo", 1,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing);	
if(i==2)
					{
						rec.set_field("SalesName","SOME NEW VAL");												
						rec.DoUpdate();	
					}	
}	
ax.TTSCommit();

Как я понимаю, выставление update=true для DataSource и userUpdate=true для QueryRun и означает "SELECTFORUPDATE"?
Как же все неудобно то...