In Oracle Apps R12 , when Purchase Order Tax Lines are searched in the Additional Tax Information Page, then instead of returning single PO Tax Line , it’s returning all Tax Lines.

The above mentioned issue is identified as an Bug 21480203 – CANNOT QUERY TAX INFORMATION IN ADDITION TAX INFO PAGE

Steps to perform PO Tax Line Search

• Query the Purchase Order in the Purchase Order Form 
• Navigate to Manage tax -> Additional Tax Information
• Click on Search Function
• The Additional Tax Information Page returns all lines instead of 1 line

Resolution Steps

• Download the Patch 21480203:R12.ZX.B from the Oracle Support 
• Request for Patch Password from Oracle Support
• Take the Backup of the Environment where patch is to be applied
• Run the Patch 
• Execute the command strings -a $XX_TOP/filename.class |grep ‘$Header’
• The below given file versions to be updated

MaintainDetFactorsAMImpl.java 120.19.12010000.7
UpdateDetFactorsCO.java 120.21.12010000.5

• Retest the issue