Query executed within a plug-in script returns 0 rows, although data exists

Question

I created a plug-in script for algorithm entity: Service Quantity Rule.
The script calls a business service that I created using query zones. The query returns the values of the bill segment (ci.bseg.bseg_id and ci_bseg.closing_bseg_sw) that is created while running a bill manually. The zone receives the bseg_id as a parameter.
The problem is that when I execute the business service within the plug-in script the business services returns 0 rows even though the data is actually being stored in the database.
The script calculates some SQI values and saves it to the bill segment based on a response that is received from MDM (I'm using the usage request object).
Steps:
1.- Create Bill. The bill segment is created in error as it is waiting for the bill determinants to be sent from the MDM. If I test the zone with the bseg_id (as a parameter) of the newly created bill segment it works fine.
2.- We send a message from the MDM to CC&B. The message is received and processed and it gets to a point when the usage updates the bill segment.
3.- After the bill segment has been updated with the values from the usage request object it starts executing the plug-in script.
4.- I obtain the bseg_id from the usage request and use the business service (passing the bseg_id as a parameter) and it returns no result.
5.- The process finishes and if test the zone with the bseg_id (as a paramter) of the billing segment it works fine.
So apparently during the execution of the script after the billing determinants are received from MDM I can't have access to the Bill segment that was created, even if the physically the record exists in the database (CI_BSEG).
I also tried instantiating an object related with the bill segment and got the same result.
Any idea or clue of what is happening?

Answer 1

Could you be more explicit.
What CC&B version?
What MDM version?
More details are required for:
2.- We send a message from the MDM to CC&B. The message is received and processed and it gets to a point when the usage updates the bill segment.
3.- After the bill segment has been updated with the values from the usage request object it starts executing the plug-in script.
4.- I obtain the bseg_id from the usage request and use the business service (passing the bseg_id as a parameter) and it returns no result.