SAP Note 17259 - Error message sap_dext called with msgnr 900

Symptom:

Keyword: client copy, DSYOL, DSYO1, DBRCLU2, OLF

The following error is recorded in SLOG during client transport with RSCLIEXP/RSCLIIMP:

DBI LOG (BZ3): invalid return code OLF received [FILE dbrclu2, LINE 4567]
DBI LOG (BZE): invalid sql error 0 [FILE dblink, LINE 400]
SQL LOG (BY2): sql error 0 occured while performing COM [FILE dblink, LINE 400]
unknown error message 0 [FILE dblink, LINE 400]
2EETW150 sap_dext called with msgnr "900"
This problem can also occur in a language transport.
Error message: inf100 "duplicate value for a table with unique key"
Table affected: DSYxx (logical cluster table).

Additional key words
Cause and prerequisites

Problem with timestamps from old cluster tables (type 1)

Solution
Please call the following commands with "dbaccess" as user "informix" in both the source and target system:

1. select count(*) from dsyo1 where (timestmp not like '19%'
and timestmp not like '0%') or timestmp is null
2. select count(*) from dsyo2 where (timestmp not like '19%'
and timestmp not like '0%') or timestmp is null

If a value other than 0 is displayed, call the following statement for the involved tables (DSY01 and/or DSY02) on the appropriate system(s):

3. update dsyo1 set timestmp = '19920000000000'
where (timestmp not like '19%' and timestmp not like '0%')
or timestmp is null

This statement can also be used for table DSYO2.

When you call the select statments from steps 1 and 2 again, no records should be found.