This happens because the SBOCOMMON DB on MS-SQL has an entry telling it that the Business One is connected to a B1A system.
1.
//Done on SBOCommon DB
SELECT * FROM dbo.SLSPP
WHERE ParamID IN
(SELECT T0.ParamID FROM SLSPP T0
LEFT OUTER JOIN SLSP T1 ON T0.CompID = T1.CompID
WHERE T1.CompType = 'IMCEsrv')
SELECT * FROM dbo.SLSP where CompType = 'IMCEsrv'
//This returns the connections to B1A HANA from B1.
2.
DELETE FROM SLSPP
WHERE ParamID IN
(SELECT T0.ParamID FROM SLSPP T0
LEFT OUTER JOIN SLSP T1 ON T0.CompID = T1.CompID WHERE T1.CompType = 'IMCEsrv')
DELETE FROM SLSP where CompType = 'IMCEsrv'
//This undoes the connection.
