sqlalchemy.exc.InvalidRequestError:无效的database.table字符串，

Question

我无法访问具有以下架构的Microsoft SQL server表。我已经导入了正确的SQL连接包，并且有正确的数据库连接URL。通过执行select查询，我已经包括了数据库中的相关表

<==
SELECT
  *
FROM
  INFORMATION_SCHEMA.TABLES;
GO

==>
TABLE_CATALOG   TABLE_SCHEMA    TABLE_NAME      TABLE_TYPE
DVMTSP30_ver1   SP              AllowedSystems  BASE TABLE

相关python代码：

#IMPORTS
from sqlalchemy.ext.automap import automap_base
from sqlalchemy import MetaData, Table

#create SQL engine

def get_all_allowed_systems(app,engine):
    url= 'mssql+pymssql://appdbowner:***@bleh.domain.local:1515/DVMTSP30_ver1'
    engine = create_engine(url)
    metadata = MetaData()
    metadata.reflect(engine, only= ['AllowedSystems'])
    Base = automap_base(metadata=metadata)
    Base.prepare()

错误：

sqlalchemy.exc.InvalidRequestError: Could not reflect: requested table(s) not available in Engine(mssql+pymssql://appdbowner:***@bleh.domain.local:1515/DVMTSP30_ver1): (SP.AllowedSystems)