How to take care of case statements while migration

Hello Sir,
using migration workbench tool for converting SQL server database to Oracle Databse.Getting error message in converting below SP with Case Statement.
Please help me in solving this problem
****** Object: Stored Procedure dbo.SP_Sec_GetScreenFieldAccessLevel
Procedure Name : SP_Sec_GetScrnFldAccessLevel
Notes :
This procedure selects data from E_E_C_field_Access_level table
CREATE PROCEDURE SP_Sec_GetScrnFldAccessLevel
AS
Select Screen_ID + '-' + FieldDescription as ScreenFieldName
,Level=
CASE
WHEN Len(IsNull(E_E_C_field_Access_level.ein_code,''))= 1 THEN campus_name
WHEN Len(E_E_C_field_Access_level.ein_code)> 1 THEN ein_name
END,
ein_name,campus_name,Urole,
IsLocked=case IsLocked
when 1 then 'Yes'
when 0 then 'No'
End
from E_E_C_field_Access_level,Field_Name_Field_Description,User_Roles_Master,EIN,Campus
where
E_E_C_field_Access_level.Screen_Field_ID*=Field_Name_Field_Description.ID
and E_E_C_field_Access_level.User_role_Id *=User_Roles_Master.Role_Id
and E_E_C_field_Access_level.ein_code *= EIN.ein_code
and E_E_C_field_Access_level.campus_code *= Campus.campus_code
and E_E_C_field_Access_level.del_flag=0
order by E_E_C_field_Access_level.date_created desc
IF @@ERROR <> 0
RETURN @@ERROR
ELSE
RETURN 0

If not using the new SQL DEveloper Migration Workbench, then u should be. I think this new version takes care of case statements.

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