Yes, there is some code in CursorFill method of the base class such as

local llRetVal
if this.datasourcetype = [ADO]
	llRetVal = dodefault(llSchema, llNoData, lnOptions, this.oADO_Command)
else
	if pcount() = 4
		llRetVal = dodefault(llSchema, llNoData, lnOptions, luSource)
	else
		llRetVal = dodefault(llSchema, llNoData, lnOptions)
	endif
endif
nodefault
if not m.llRetVal && There was an error trying to execute CursorFill
	local laError[1]
	aerror(laError)
	if laError[1,1] <> 1839
		=ErrorMsg("Error trying to execute CursorFill method: " + laError[1,2] + ;
			chr(13) + chr(10) + "SelectCMD is " + this.selectcmd)
	ELSE
		
		if vartype(m.plStop) = "L"			
				this.lRepeatRequery = not m.plStop
		endif
	endif
endif

return m.llRetVal

which probably was my own addition, though.