def receipt(df):
    """
    Return a dataframe to verify if a item has a receipt.
    """
    mutated_df = df[['IdPRONAC', 'idPlanilhaItem']].astype(str)
    mutated_df['pronac_planilha_itens'] = (
        f"{mutated_df['IdPRONAC']}/{mutated_df['idPlanilhaItem']}"
    )

    return (
        mutated_df
        .set_index(['pronac_planilha_itens'])
    )
Return a dataframe to verify if a item has a receipt.