Nested OData $filter with one field must equal and a second must not equal

I am trying to filter on two variables.

  1. field MaterialNumber must equal a specific vale

  2. second field EquipmentNumber must not be null

Example postman query

https://whateverurlineedhere/api/se/ToolStringEquipmentUses?$filter=MaterialNumber eq ‘123456-003’ and EquipmentNumber ne ‘null’

returns all entries with the correct Materialnumber, but does not filter out the null Equipmentnumber entries. any ideas?

Thank you,

Resolved. removed single quotes from around null.