No save data into database immediately after executing SQL 'MODIFY'

I encountered a tricky issue on customer's system as described below:

In order to insert multiple records into database, we have a statement to trigger:

MODIFY DB FROM itab.

• No commit work continued ***

The above command cannot trigger database commit until explicitly calling 'COMMIT WORK' via debugging.

But there would be not this issue on our system.

My question is: Can this behvarior be configured in SAP R/3 system? or depend on database?

Thanks a lot,

Boer