Good link for ISU Basics

https://sapyard.com/isu-installation-meter-reading-bill-order-billing-invoice-and-invoice-printing-process-overview/

CRM ISU Data Model

CRM ISU Data Model

CRM Identification screen - IS-U integration

http://help.sap.com/saphelp_crmscen70/helpdata/en/20/f984bfca3f4312bf6ebab36673036b/content.htm

In Customizing for Customer Relationship Management under  Industry Solutions Utility Industries Settings for User Interfaces Identification Define Identification Profiles , define the identification profiles for the technical componentIUICMD (Identification & Master Data) in the interaction center.

BAdI:Identification and Master Data

This Business Add-In (BAdI) is used in the Utilities Industry: Interaction Center (CRM-IU-IC) component.

With BAdI Identification and Master Data (CRM_IUICMD_BADI), you can implement methods that allow you to adjust the identification to meet your own requirements.

This allows you to change pushbuttons, searches, and context areas.

Default Settings

The BAdI implementation CRM_IUICMD_BADI is active as standard. The default coding is also executed if no customer implementation exists. The BAdI is not filter-dependent. The BAdI is designed for multiple use. All activated implementations are called and executed.

Activities

For more information about the implementation of BAdIs within the enhancement concept, see SAP Library for SAP NetWeaver under BAdI Implementation. See also: This BAdI uses the interface IF_CRM_IUICMD_BADI. For more information, display the interface in the Class Builder.

ISU Tcodes and Tables

ISU Tcodes:

ECRMREPL -  Error log report (Middleware - similar to SMW01 in CRM)
ECENV_BP -  Check Contract accounts and Contracts for a BP account
EPRODCUST - MDT

EL37 - Meter read reversal
EA13 - Bill reversal (need to give Print document)
EA14 - Mass Bill reversal

ISU Tables:

EVER - ISU contract
EVERH - Doc flow

FQEVENTS  - Event managing  - this is like BT events (user exits)

SPPFCADM - Actions profile management

EA63PS - Payment Scheme display


DFKKCOH - Table for Correspondence entries in ISU 

EA85 - Rate determination create

ETTIFN - Installation Facts (Normal)

EABL - Meter Read document


Tables for Rate categ facts: ERTFND  and  EKDI

ES62 - Premise change

ES30 - Installation Create


CRM Tables:

CRMV_ISU_INDEX_H -  Link between CRM and ISU transaction numbers
ISU_POD -  POD details in CRM
CRMD_ORDERADM_H - Transaction header
CRMD_ORDERADM_I - Transaction Item
CRMD_ISUEXTA4 - Isu details