Database error -901 at OPC

Hi SAP Gurus,

We are running Data load (data load to InfoPackage) job from Process chain daily. Around once or twice a month the job is filing with error occur in source system. In source system error is "Database error -901 at OPC".

Here is error log from SM21:

Database error -901 at OPC

> SQL system error. MSGID= Job=186933/SCP54/WP20

Database error -901

Detail log in first error is:

Module nam Line Table Name Field Name

dbds       398  -901       OPC

If I restart job it finished fine. It might not fail for few days. Work process change every time. We check IBM AS400 side, no error.

Thanks in advance for help.