Hi all, I have CDT where one of the parameter in it's fiels name have &

Here's one method: You can create an expression rule using the substitute function: substitute(ri!string,"-","_")
Then after querying the database and saving the result into a pv!, you can use the apply function to change the hashes to underscores: apply(rule!ruleName,pv!cdtName.strings)

forum.appian.com/.../Text_Functions
forum.appian.com/.../Looping_Functions

Sorry I can not find apply expression. Let me say what I did maybe I did not understand you correctly or maybe I did not explain my problem correctly.
I have following rule create (or when I try to created it);
= rule!ContractTypeDetails2 ( ri!Company ) [ lookup ( rule!ContractTypeDetails2 ( ri!Company ) .TypeName , ri!typename , 1 ) ] .Signatory-Level1
where ContractTypeDetails2 is the query rule.
But when I even try to test it before even save it following error appear:
The rule contains an expression that cannot be tested:
!isignatory, !level1
I create new rule as you suggested :
SubsistuteUnsupportedsymbols and redefine the rule but same problem.
= rule!ContractTypeDetails2 ( ri!Company ) [ lookup ( rule!ContractTypeDetails2 ( ri!Company ) .TypeName , ri!typename , 1 ) ] .SubsistuteUnsupportedsymbols(ISignatory-Level1)
Any new ideas or suggestions.

I just sow. Apply() is new expression function implemented in Appian 6.7 and I still have Appian 6.6.0. Am I right? Any other suggestion?

Have you tried putting your field within single quotes?:
rule!ContractTypeDetails2 ( ri!Company ) [ 1 ] .'Signatory-Level1'

Also, can you give me the output of one object if you do not get this sub-attribute? So, just the following?:
rule!ContractTypeDetails2 ( ri!Company ) [ 1 ]

I'd like to see if it gets returned as Signatory-Level1; I'm assuming it does.