My issue has been resolved. Actually, some thing is wrong with ownership and access rights on RSA_SUSER & RSA_DBA. I remove the database "RSA" & users "RSA_DBA & RSA_USER" and recreate using below script.
For Creating Database
**********************************
USE MASTER
GO
CREATE DATABASE RSA ON PRIMARY(
NAME='RSA_DATA',
FILENAME='K:\Microsoft SQL Server\MSSQL\Data\RSA_Data.mdf',
SIZE=10MB,
MAXSIZE=UNLIMITED,
FILEGROWTH=10%),
FILEGROUP RSA_INDEX(
NAME='RSA_INDEX',
FILENAME='K:\Microsoft SQL Server\MSSQL\Data\RSA_Index.mdf',
SIZE=10MB,
MAXSIZE=UNLIMITED,
FILEGROWTH=10%)
LOG ON(
NAME='translog',
FILENAME='L:\Microsoft SQL Server\MSSQL\Data\Logs\RSA_Log.ldf',
SIZE=10MB,
MAXSIZE=UNLIMITED,
FILEGROWTH=10% )
GO
ALTER DATABASE [RSA] SET RECOVERY SIMPLE
GO
CHECKPOINT
GO
**********************************************************\
For creating Users
**********************************************************
USE MASTER
GO
CREATE LOGIN RSA_DBA WITH PASSWORD = Netsolpk1, DEFAULT_DATABASE = RSA
GO
CREATE LOGIN RSA_USER WITH PASSWORD = Netsolpk1, DEFAULT_DATABASE = RSA
GO
USE RSA
GO
ALTER AUTHORIZATION ON DATABASE::RSA TO RSA_DBA
GO
CREATE USER RSA_USER FOR LOGIN RSA_USER
GO
CHECKPOINT
GO