Additional data on relationship between two objects

Hi
We have a requirement to capture additional data on a relationship between two objects.  The data to be captured are custom fields that are unique to the relationship between the objects and not specific to either of the objects.
We created a new object type and related it to the position (S)and the job (C) object.  In the customising (Personnel Management/Personnel Development/Basic Settings/Maintain Relationships there is an option to set up Additional Data.  There are however several restrictions (e.g. the substructure has to be in T77AD).  When you set up an existing substructure (e.g. PAD22) and screen (e.g. 3000), it works really well, however we have not been able to get this to read our own substructure and screen (since there is no customer include on HRP1001 and the 'Additional data' button seems to go to MP100100 to find the screen).
My question is two fold:
a) Is this an allowed customisation (e.g. can we create our own substructure, screen and Query string)? And if so, how does the data get into T77AD (since SAP recommends that data should not be added to this table)? and
b) Is there any documentation on this (thus far I have only received info on how to enhance infotypes which I don't think is relevant???)?
If this can not be maintained is there any other suggestions on how to deal with this scenario?
Any assistance will be appreciated.
Regards
Liezl

Hi everyone
Thanks for everyone who tried to assist us with this.  I am happy to report that our in-house guru's have found the answer.  So, for anyone who is interested:
In programme MP100100 you have a screen 6000 which is a customer enhancements screen.  We set up two in-house function modules for the PBO and PAI with its own screen and added an append structure to PAD31 to add the fields required.  In the configuration, we then specified PAD31 as the substructure with screen 6000 and then also specified our own PBO and PAI function modules.  The parameters required for screen 6000 is set up within our own customer screens.
Hope this will be helpful to someone - it certainly seemed to open up some doors for us!
Regards
Liezl

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