Expression is not valid, Provide an expression that describe value

Hi expert,

I have a question.

We have created a Custom code list (with the name BCO_BPROLE) that contains: BPRole, OrderType, Description and values can be added in fine tuning.

In PDI I am going to write a script that read the Codelist values from C4C and check with the value that is going to be inserted now.

foreach (var a in BCO_BPROLE.BPRole )

{

foreach (var b in BCO_BPROLE.OrderType)

{

//do something

}

}

but I get an error that says: Expression is not valid, Provide an expression that describe value

I am new in SDK and I can not understand what is the problem.

Can anyone help me about this?

Regards

Sep