Hi
GR/IR clearing automatically done in F.13 based on the configuration in OB74. This can be scheduled as background job on periodic basis.
MR11 is used to do the clearing of documents which does not have opposite entries like
Goods received but there is not Invoice received. or vice versa.
You have an option to do automatic clearing radio buttion under processing tab of MR11. This can be scheduled as periodic job.
You can set up background job with in the same tcode.
regards
HK