>>>Hi,
>>>
>>>Could someone suggest why I am having a problem (actually not me but the customer) in the following segment of code:
>>>
>>>The container with the text box has a property control_source. This property has a value V_WORK.EMPLOYEE
>>>
>>>The code then checks is the value of the field EMPLOYEE in the cursor V_WORK has been change. Here is the code:
>>>
>>>

>>>		cControlSource = ALLTRIM( this.control_source )
>>>		IF EVALUATE( cControlSource ) == OLDVAL( cControlSource )		
>>>			RETURN .T.
>>>		ENDIF 
>>>

>>>
>>>The problem occurs on the line above, EVALUATE( cControlSource ) == OLDVAL( cControlSource ), and it does
>>>ALIAS IS NOT FOUND. I verified that the entry in .control_source exists as described above.
>>>
>>>TIA.
>>>
>>>UPDATE. the following code checks that the alias V_WORK exist and is open. This code, below, is before the code above (just in case someone wonders if the alias is indeed exists and open
>>>

>>>
>>>IF !EMPTY( this.control_source )
>>>	cAlias = SUBSTR( ALLTRIM(this.control_source), 1, AT('.',ALLTRIM(this.control_source)) - 1)
>>>	IF SELECT( cAlias ) > 0
>>>		cControlSource = ALLTRIM( this.control_source )
>>>		IF EVALUATE( cControlSource ) == OLDVAL( cControlSource )		
>>>			RETURN .T.
>>>		ENDIF 
>>>      ENDIF
>>>ENDIF
>>>

>>
>>I added - for testing - a TRY / CATCH around the above code. Then modified the line:
>>

>>cControlSource = ALLTRIM( this.control_source )
>>

>>to a bogus:
>>

>>cControlSource = "test.test_field" 
>>

>>
>>And the error caught by the TRY / CATCH, says "Alias 'test' not found".
>>But the error that the customer saw (without a TRY /CATCH) did not have the "bad" alias name. It was simply:
>>ALIAS IS NOT FOUND
>>
>>Any suggestions?
>
>Could there be a possibility that the control_source property be assigned a value other than what you're expecting it to be (in particular when the code is run at the customer location where the orignial problem is occurring) ?
>could there be a possible problem like "pointer aliasing" going on?
>

>* object "foo" contains object "bar" which in turn contains object "baz".   Object "baz" has property named "propname"
>foo.bar.baz.propname = "some value"
>= SubProc( foo.bar.baz )
>* value of "propname" property would have changed.
>
>FUNCTION SubProc( yuck )
>    yuck.propname = "other value"
>ENDFUNC
>

I don't think the above scenario is possible. But I will think of it.
Thank you.