AA ttypes not mapped Asset Hist Sheet Grp-still showing in Asset HistSheet!

Hi SAP gurus. My client has an issue in their AA SAP ECC 6.0 instance . AA Transaction types 800, 820, 897, 892 were defined for revaluation (AO84) but not mapped to an asset history sheet group. However even wihtout being assigned to Asset History sheet group the transactions can be seen in Asset History sheet S_ALR_87011990 version 0006. raised OSS note to sAP about it but was told it was a consulting issue. Grateful it works but would like to understand why as I though all AA ttypes needed to be assigned to An asset history sheet group to appear in any asset History sheet at all! I can see this in all our clients. .