This voucher cannot be changed because it is currently in use by Budget Checking process. (7030,986)

Error :

This voucher cannot be changed because it is currently in use by Budget Checking process. (7030,986)
Resolution :

Update the fields IN_PROCESS_FLG = 'N' and  PROCESS_INSTANCE = 0 in PS_VOUCHER table.
UPDATE PS_VOUCHER SET PROCESS_INSTANCE=0 , IN_PROCESS_FLG = 'N' WHERE BUSINESS_UNIT ='ABCD' AND VOUCHER_ID='V001'

Update the field KK_PROCESS_STATUS ='V' in PS_KK_SHDR_APVCHR

UPDATE PS_KK_SHDR_APVCHR SET KK_PROCESS_STATUS='V' WHERE BUSINESS_UNIT ='ABCD' AND VOUCHER_ID='V001'

Run the budget check process again.