How to get material number form ASN table in SNC?

Hello,

    I can get field  'MATID'  with value as 'C81F66B897161EE48AB9BFB316BDBFB6'  from ASN table ' /1OM/DELV2IT2600'， but I don't know from which table I can get material number .

   I know the table '/SAPAPO/MATKEY' include matrial number,  the table has same filed 'MATID' but value  as 'o1zck9SM7kIAj1tBJdvub0',  I have no idea.

   Anyone can help me ?

   Thanks

   Jesse