need to add a case statement

I have the following query

SELECT
                        legal_entity_name, legal_entity_identifier, operating_unit, functional_currency_code,

transaction_class, transaction_source
                        ,transaction_type, trx_date, gl_date, tax_invoice_date, bill_to_customer_name
                        ,bill_to_cust_number, bill_to_site_number, cust_bill_to_add1, cust_bill_to_add2, cust_bill_to_add3
                        ,cust_bill_to_add4, cust_bill_to_city, cust_bill_to_zip, cust_bill_to_state, cust_bill_to_country,

bill_to_site_payment_term
                        ,ship_to_customer_name, ship_to_cust_number, ship_to_site_number, cust_ship_to_add1,

cust_ship_to_add2
                        ,cust_ship_to_add3, cust_ship_to_add4, cust_ship_to_city, cust_ship_to_zip, cust_ship_to_state
                        ,cust_ship_to_country, DECODE(bill_to_cust_tax_ref,NULL,bill_to_cust_tax_ref,''''||

bill_to_cust_tax_ref) bill_to_cust_tax_ref, payment_terms, invoice_currency_code, conversion_type
                        ,trx_number, complete_flag, line_number, description, quantity
                        ,unit_selling_price, extended_amount, tax_classification_code, tax_rate, tax_extended_amount
                        ,entered_gross_inv_amount, functional_inv_amount funcational_inv_amount, functional_tax_amount

funcational_tax_amount, functional_gross_inv_amount ,trx_created_by ,line_line_type, tax_account, revenue_account,

revenue_natural_account_desc, receivable_account,tax_law_ref, tax_law_desc, tax_exemption_text, org_id
                        ,customer_trx_id, customer_trx_line_id, tax_customer_trx_line_id, exchange_rate,

functional_currency_precision
                        ,printing_original_date,purchase_order, purchase_order_date, purchase_order_revision,

sales_order_source
                        ,sales_order, sales_order_date, sales_order_line, sales_order_revision,

fr_transaction_class,period_name, period_year, quarter_num,special_customer_type, header_comments, header_context_value,

header_attribute1, header_attribute2,
                         header_attribute3, header_attribute4, header_attribute5, header_attribute6, header_attribute7,
                        header_attribute8, header_attribute9, header_attribute10, header_attribute11, header_attribute12,
                         header_attribute13, header_attribute14, header_attribute15,

line_context_value,line_attribute1,line_attribute2,line_attribute3,line_attribute4,line_attribute5, line_attribute6,line_attribute7,

line_attribute8, line_attribute9, line_attribute10, line_attribute11,
                         line_attribute12, line_attribute13, line_attribute14, line_attribute15,            
                         original_transaction_number, original_transaction_date, original_trx_tax_invoice_date, DECODE

(global_context_value,'JE.PL.ARXTWMAI.CLE_TRX_INFO',TO_DATE(global_attribute14,'YYYY/MM/DD HH24:MI:SS'),NULL) sales_date, reference,

gta_vat_invoice_number, gta_vat_invoice_date, gta_vat_net_amount, gta_vat_tax_amount, gta_vat_total_amount,tax_rate_code,

tax_rate_name,tax2_rate_code, tax2_rate_name,tax2_rate,tax2_extended_amount,tax3_rate_code,

tax3_rate_name,tax3_rate,tax3_extended_amount,functional_tax2_amount,functional_tax3_amount,tax2_account,

tax3_account,tax2_customer_trx_line_id,tax3_customer_trx_line_id,tax_natural_account_desc,tax2_natural_account_desc,
                         tax3_natural_account_desc,receivable_natural_acct_desc,
GLOBAL_CONTEXT_VALUE,GLOBAL_ATTRIBUTE1,GLOBAL_ATTRIBUTE2,GLOBAL_ATTRIBUTE3,GLOBAL_ATTRIBUTE4,GLOBAL_ATTRIBUTE5,GLOBAL_ATTRIBUTE6,GLOB

AL_ATTRIBUTE7,GLOBAL_ATTRIBUTE8,GLOBAL_ATTRIBUTE9,GLOBAL_ATTRIBUTE10,GLOBAL_ATTRIBUTE11,GLOBAL_ATTRIBUTE12,GLOBAL_ATTRIBUTE13,GLOBAL_

ATTRIBUTE14,GLOBAL_ATTRIBUTE15
                  FROM
                  XXX                  WHERE legal_entity_id = :legal_entity_id_param
                  AND      operating_unit = NVL(:operating_unit_param,operating_unit)
                                    AND NVL(tax_classification_code,'##') = NVL(:tax_classification_code_param,NVL(tax_classification_code,'##'))
                  AND invoice_currency_code = NVL(:entered_currency_param,invoice_currency_code)
                  AND (bill_to_customer_name||' - '||bill_to_cust_number) = NVL(:bill_to_customer_param,

bill_to_customer_name||' - '||bill_to_cust_number)
                  AND      complete_flag = 'Y'


i want to select GLOBAL_ATTRIBUTES only when the  GLOBAL_CONTEXT_VALUE= 'JE.RU.ARXTWMAI.CLE_INV_INFO'


i dont want to add the filter in the where  clause as this  query is used by many reports