EPSTP (PSTYP) field to grey up dynamically in ME5xN tx

Hi all experts,
a tricky task, I'm losing months over this but without finding any acceptable solution.
I have a simple requirement: any Purchase Requisition's item that meets particular conditions (e.g. field ZSTATE <> 0) must show the PSTYP field (Item category) grey, not editable.
This is -obviously- a dynamic condition that must be checked runtime; moreover, since it involves each row of the purchase requisition, the solution of a screen variant seems not suitable (moreover, I don't know if it's possible to switch dynamically between variants).
Details: SAP_APPL 46C (quite old). No active BADIs as far as I've seen. The only user exit I've seen for these tx are the EXIT_SAPLMEREQ* family.
Tried so far:
- EXIT_SAPLMEREQ_007 is triggered any time a Purchase requisition is loaded and for any row in the PR; I can easily check if conditions are meet for any single item, but unfortunately there's no visibility over the correct SCREEN in it, so I cannot work on the visibility of that field.
- Same for EXIT_SAPLMEREQ_005; this ue is triggered every time the user press the ENTER key; i can easily check if conditions are satisfied for any single item, but once more, no visibility on SCREEN to disable that field.
- I tried to activate an ad-hoc field-exit (not yet deprecated on 46C) without success...
I should avoid - if conditions at item granularity are meet - any user operation on that field (EPSTP pressing F1 on the grid in the tx, which corresponds to the PSTYP field in EBAN) for that row; seems to be an impossible task, so I'd ask you to support me with some info and help on how accomplish this requirement. I guess if there's a way yo retrieve info on the screen and modify that at runtime in an usr exit, in cases like mine in which SCREEN visibility is almost inexistent.
EDIT:
I found an interesting description of the MEREQ001 exits family:
[http://sapass.metro.client.jp/UserExit/MEREQ001.htm|http://sapass.metro.client.jp/UserExit/MEREQ001.htm]
I think that
EXIT_SAPLMEREQ_007: Read Customer's Own Requisition Data when Reading Requisition
is a good place to start from. I've seen there's a (partial) implementation on the backend and this userexit is always triggered @ load time of a PR for every item. I can easily check there if a particular item meets my condition, but then I don't know how to make the EPSTP/PSTYP field non-editable on the transaction screen. Any help?
Edited by: Matteo Montalto on Jun 30, 2009 5:56 PM

Hi,
I think you are done lot of research on user exit's for PR,
small help from you regarding PR creation,
my requirement is while creating PR have to show how much quantity is available for requested material based on the plant and storage location in POP-UP or New Tab strip,
which exit can use for this, if we create new screen for this(Tab strip) , is it possible to show all the details in tab strip for that material,(user will enter multiple line items, will it change dynamically?)
Regards,
Suresh

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