Error tracking in 'MEASUREM_DOCUM_RFC_SINGLE_001'

I have a requirement for reprocessing the errors while creating measurement documents using BAPI 'MEASUREM_DOCUM_RFC_SINGLE_001'.

The program will run in the background. I have an internal table which will store status (processed or not). I have two queries in this.

1) How track the measurement points for which documents are not posted to IK11.

This function module does not have return parameters.

2) What should be the code to call the program in background for the unprocessed documents?