rdisp/rfc_use_quotas is a SAP Parameter attribute which is used to control Switch to enable/disable RFC quotas information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
The RFC resource check can be activated with this parameter:
0 : Resource check is not active
1 : Resource check is active (default)
The resource check is based on determining the resources that are
currently used for the users of asynchronous RFCs and then to give an
indication based on this whether further RFC calls are possible or if it
is necessary to wait for the outstanding TFC calls to be completed
first. The procedure must be used by the application explicitly (for
example, see CALL FUNCTION ..., DESTINATION IN GROUP ..., or SPBT_*
modules).
You find implementable resource criteria in the section "Are other
parameters affected or dependent".
See SAP Parameter Documentation for full SAP documentation for this profile parameter.