Extraction:FM CRM_BW_DOCFLOW_DETERMINE_I takes a lot of time

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Symptom
During extraction of data from CRM to BW,the document flow FM CRM_BW_DOCFLOW_DETERMINE_I takes a lot of time for processing and also
consumes a lot of memory.
Other terms
Extraction,datasource,performance
Reason and Prerequisites
Performance
Solution
Implement attached correction instructions