How the Target Days Supply field in SNC is populated ?

Hi all ,

Normally Safety stock method (SM,SZ,SB)will be determined by the material from ERP system.

when we CIF a material from ERP with field 'Safety time /act.cov .' then Safety stock method will be SZ in SNC. Safety Days of Supply field value is populated from 'Safety time /act.cov .' How the Target Days Supply field in SNC will be populated ?

Regards

Guru