APO : consistency check frequency and use

Hi,

in our system APO, we have dumps during Consistency check because of interactive users connection :

SQL error in the database when accessing a table.

Database error text........: "ORA-00060: deadlock detected while waiting for

  resource"

Internal call code.........: "[RSQL/178//SAPAPO/MATLANE ]"

First we changed parameter on each table /SAPAPO to have more concurrent access ( found in an oss note).

The consistency check are planned in each process chains, not in dedicated job.

When the dump occur, it cancelled the process chain.

What's the best practice about consistency check for SNP ? PPDS ?

Do we have to lock users during these treatments ?

Is it normal that if we have concurrent access in modification in the same time, the 2 requests are cancelled ?

I mean, we've got 2 dumps :

- one for the user in dialog

- one for the PC

in my opinion, the first in modification has a lock and could continue to work...It's not the case here.

Thanks for your feedback.

Regards