Value field is closed in Manage Item Rule

Summary:

Hello,

How can below field be opened up? I need to write a rule where the results of subsequent EFFs are dependent on a particular value in TUR Main Fiber Blend attribute.

Thank you.

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Code Snippet (add any code snippets that support your topic, if applicable):

The code snippet I am trying to implement is as below:

[Item].[TUR FG Item Code].[TUR Main Fiber Blend] == "00" && [Item].[TUR FG Item Code].[TUR Second Fiber] != "0" && [Item].[TUR FG Item Code].[TUR Third Fiber] != "0"