User Exits
User Exits in Transaction ME21N
Adding a Field Exit

If you need a ABAP Book, then this is the best
ABAP Objects: Introduction to Programming SAP Applications with CDROM

ABAP Certification Guide Book
ABAP Programming: A Guide to the Certification Course

Integrating ABAP and VB
SAP R/3 Data Integration Techniques using ABAP/4 and Visual Basic

Interfacing SAP with BAPI
SAP R/3 Interfacing Using BAPIs; A Practical Guide to Working within the SAP Business Framework with CDROM

SAP Java and BAPI
Java and BAPI Technology for SAP

Learning SAPscripts
SAPscript Made Easy 4.6

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