Event class-WIP Variance in Cost Management SLA

Need some clarification for WIP variances calculation- Once when a job is closed If there is variance for cost element -Material , by default it hits to '50000' but with SLA it should hit to different account say '12345' .And also in the material variance if there is specific 'Reason code'- 'Manuf' (we can see this reason code coloumn in Material trx's form) it should hit to '12345' and if there is no reason code it should go to standard account '50000'

and cost element- Overhead variance hit to default standard account '51000' no customization is needed.