Use CUSTOM.pll for forms customization
What is the CUSTOM Library - Standard oracle liabrary supplied with Oracle Applications - Allows customer to enhance standard functionality of the oracle Applications - Every forms based screen will access CUSTOM.pll - Ideal point to create business rule which affects entire organization - This is the Only method supported by Oracle for Oracle Applicaitons enhancements How to Use the CUSTOM Library Since the CUSTOM library is a typical Forms PL/SQL library, it can include standard PL/SQL logic, Oracle Forms built-in commands and may have other Forms PL/SQL libraries attached to it. The base CUSTOM library is located in the $AU_TOP/resource directory on your forms server. Explore the CUSTOM.pll using the Oracle Forms Designer module to examine the sample code that exists in library. Once any enhancements are made, the library must be generated into an executable library (CUSTOM.plx) that then can be used by the Oracle Applications Forms runtime mo...