Below is a list of useful SAP PI related transaction codes which will help yuu build and maintain PI/XI interfaces and other functionality in SAP.

ABAP Transactions | BW | HR | Workflow | Table Maintenance | Other (FI,MM,CO...) |

SXMB_IFR
Exchange Infrastructure tools including Integration Directory(Design) and the Integration Repoitory (Configuration)

SXI_CACHE
Used to clear cache after changes have been made in design and configuration sections


SXMB_MONI
XML Message Monitoring



SXI_ADM
Administration Console

SM59
SAP and PI RFC Connection Maintenance