PowerApps `not in`

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“not operator along with the custom named condition operators is not allowed”

Operator <> or NOT In. In and Exactin

For example in an Items of Gallery :

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With(  
    {  
        userlevel_isnot_banker: First(colSession).UserLevel <> "Banker",  
        isnotteamhead: First(colSession).CurrLevel <> "RO",  
        isnotbanker: First(colSession).CurrLevel <> "Banker",  
        ro: First(colSession).CurrTeam,  
        banker: First(colSession).CurrBanker,  
    },  
    Filter(  
        WAM_Trade_Summarizes,  
        FinalDate_yyyymm in ComboBoxTradeFinalDate.SelectedItems,  
  
        (isnotteamhead || RO_gb=ro),  
        (isnotbanker || GroupBanker_gb=banker),  
  
        (userlevel_isnot_banker || (  
            Statement_prod_type_gb <> "Extra Rate" &&  
            Statement_prod_type_gb <> "Management fee" &&  
            Statement_prod_type_gb <> "Error"  
        ))  
    )  
)

Use this

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(  
            Statement_prod_type_gb <> "Extra Rate" &&  
            Statement_prod_type_gb <> "Management fee" &&  
            Statement_prod_type_gb <> "Error"  
        )

instead of

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!(Statement_prod_type_gb in ["Extra Rate", "Management fee", "Error"])

or

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Not(Statement_prod_type_gb in ["Extra Rate", "Management fee", "Error"])