Could you show me the IDs for all documents with budget types described as 'Organisation'?
SELECT T1.document_id FROM Documents_with_expenses AS T1 JOIN Ref_Budget_Codes AS T2 ON T1.Budget_Type_code   =   T2.Budget_Type_code WHERE T2.budget_type_Description   =   "Organisation"
IDs for all documents refers to document_id; budget types described as 'Organisation' refers to WHERE budget_type_Description = 'Organisation';