No Business reason provided for the request, please state why it's needed and reason the current number is not sufficent as Recn Ref 1 is used for Stock Number, Wty Claim Number is the purpose for this field and existing 20 characters has been enought for all customer worldwide to date. Amendeding such means many screen and reports could be effected like GL Enquiry, Transactions Reports, Creditors, Debtors etc.
It's an enhancement request not a defect.