Call information from many lists

Hi, im new in appian. I create a get api integration which recieve multiple lists those lists recive another ones. Also i create a expression rule to parse this information with my CDT. On my forms i call this rule and it works with text information but not with lists. 

This is my interface:

This is my rule expression:

This is my CDT:

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    Certified Lead Developer

    I have a hard time following you. Do you mind explaining in more detail what you want to achieve, what you are doing, and what you observe?

  • basically as you see I have an expression rule that joins the information I receive from a GET API with a CDT. In the response of the rule expression we can see all the fields and lists that it brings. This rule expression is called locally in the forms that I show in the first image, you can see that some filed text is already being shown from the API response but for example I want to call the first item of the list "condicionesPoliza" or some subfield that it has and it does not allow me, I get an error that cannot index because its an array type. And as you can see in the rule expression I have many lists that I need to put in the forms, call the item that corresponds to each field.

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  • basically as you see I have an expression rule that joins the information I receive from a GET API with a CDT. In the response of the rule expression we can see all the fields and lists that it brings. This rule expression is called locally in the forms that I show in the first image, you can see that some filed text is already being shown from the API response but for example I want to call the first item of the list "condicionesPoliza" or some subfield that it has and it does not allow me, I get an error that cannot index because its an array type. And as you can see in the rule expression I have many lists that I need to put in the forms, call the item that corresponds to each field.

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