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Author's profile photo Biswamber Swain

SLT – Calculation job in sender system could not be started


The SAP Landscape Transformation (SAP LT) Replication server is one of the tool provided by SAP for data migration. This tool can be used for real-time (and non-real-time) data replication sourcing from SAP or non-SAP systems into SAP systems.

This blog explains the process to troubleshoot where Calculation job in sender SAP system could not be started. The table replication status in SLT remains in Calculation step for sometime and then the status changes to Calculation failed.

The SAP systems which are involved in the troubleshooting process are as below:

System Details:

CAR : CARAB 5.0 , DMIS 2018 SP08

SLT : SLT 3.0, DMIS 2018 SP08

ECC : EHP8 for SAP ERP 6.0, DMIS 2011 SP23.



Issue Details

This SLT configuration is a RFC connection for both Source CAR to Target ECC System.


LTRC – Screenshot

In this scenario, we have only few tables that are getting replicated from CAR to ECC. These are custom tables that were created in CAR & ECC. And the data gets populated in CAR for those tables which then get replicated to ECC via SLT.

So, I got a replication issue for which I needed to do the initial load for the table. While doing the initial load I got the error “Calculation job in sender system could not be started”.


LTRC – Application logs


Troubleshooting Steps

I checked the system logs in the sender system (CAR) and found that there is an error in scheduling a batch job named R_JR_BTCJOBS_GENERATOR. The reason was that SAP_SYSTEM user was not existing.


SM21 – System Logs

But this user generally doesn’t exist until manually created. Then I checked to execute the report R_JR_UTIL_1 which shows the step user that is being used in the standard technical job repository.



Report R_JR_UTIL_1

Then I checked DDIC user status and found that DDIC is locked and SAP_SYSTEM user also doesn’t exist. Hence, the job was getting error in scheduling.

Here there are 2 ways to fix it.

  1. Unlock the DDIC user if that is allowed.
  2. In certain projects DDIC user is kept locked and, in that case, if you don’t have an alternate DDIC like super user in the system then create a system user with SAP_ALL access and make that user as default step user for the standard jobs by using either the report R_JR_UTIL_1 or directly using T-code SJOBREPO_STEPUSER.

Using the Report R_JR_UTIL_1 :

After that if you check again for the Job repository status, it will show that user as default step-user which you had set.

Using the T-code SJOBREPO_STEPUSER :

After that the job R_JR_BTCJOBS_GENERATOR scheduling error got resolved and the calculation job gets triggered in the sender system (CAR) and the table gets replicated to ECC without any issue.

Hope you find the above troubleshooting information useful.

Referred SAP Notes in support to the above troubleshooting process:

2806958 – Calculation job in sender system could not be started – SLT

2864455 – Replication fails with “Calculation job in sender system could not be started” – SLT

2190119 – Background information about SAP S/4HANA technical job repository




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