For each collection you can specify a call number prefix. When you select a collection in Item Maintenance, this prefix is inserted automatically. This can be overridden in Item Maintenance for individual items if required.
For example, say that items in the RL collection have a call number prefix "REF". An item in this collection with a class number 220.5 and a suffix ENN will therefore have a call number REF 220.5 ENN.
To specify the call number prefix for a collection:
If you change the call number prefix for a collection, you can click the Reset item prefix button on the General tab to update the prefixes for items in the selected collection. The prefix is not updated if the item has Prefix overwrite selected.