Hi John
Looking at vendor block data you have:
Transactions FK05/MK05.XK05 for Block/Unlock Vendor
For All company code/purchasing org there are fields SPERR - Central Posting Block and SPERM - Central Purchasing Block - in LFA1 table
But if the block is company code level then you have table LFB1 for field SPERR - Posting Block for Company Code and table LFM1 for field SPERM - Purchasing Block for purchasing organisation. There will be records for each company code or purchasing org that the vendor exists for.
I haven't configured process controls for the automated monitoring. However, if trying to find data I recommend look in the source system transaction to see where data is stored or talk to your functional consultant. In particular, your functional consultant may need to provide advise on custom developments, etc to consider in your scope of analysis.
Regards
Colleen