>>>The aPostedmaterials is an array. And it is used in a few places. What does "undefined" mean?
>>>
>>>TIA.
>>
>>In the procedure that uses this array add
>>
>>EXTERNAL ARRAY aPostedMaterials
>>
>>This is a compiler error and it can also be safely ignored.
>
>You are right. I have commented some code and the warning went away. Except for one:
>
>I also have the compiler warning that say
>Visual class library THIS - Undefined. What should I look for this "THIS"?

This looks like some typo in the code. Does it say where you're getting this error (e.g. which form or class)?