The following error is received when trying to connect to the Biotics 5 database via Crystal Reports using Oracle 10g on a Windows 7 machine:

SP2-1503: Unable to initialize Oracle call interface
SP2-0152: ORACLE may not be functioning properly


As identified in Oracle Doc ID 1531248., the minimum version of Oracle Database Client that is certified with Windows 7 (32 bit) is

Version is not certified for Windows 7.

How to identify your version of Oracle?

In the DOS prompt, type in sqlplus - that's it - don't log into a database.  The version of your Oracle client will be displayed.

The error does not occur using SQL*Plus

Upgrade SQL*Plus from to (or 11g, if possible)

Oracle Database 10g Release 2 Client 32 bit ( and higher) is certified for Windows 7 32 bit.