https://userapps.support.sap.com/sap/support/knowledge/en/3528170
3528170 - ESI - Regenerate option in SPROXY is grayed out | SAP Knowledge Base Article
When displaying a Proxy Structure object in SPROXY transaction, the "Regenerate" button is grayed out
https://userapps.support.sap.com/sap/support/knowledge/en/2020228
2020228 - SPROXY error CX_SRAPI_PRECONDITION_VIOLATED | SAP Knowledge Base Article
You have an R/3 backend system connecting to a Process Integration (PI) system for ABAP proxy communication When calling transaction SPROXY the following dump...
sap knowledgeerrorcx
https://userapps.support.sap.com/sap/support/knowledge/en/2370153
2370153 - Connection problems setting up SPROXY to PI ESR | SAP Knowledge Base Article
You are configuring a connection between an ABAP backend R/3 system and a Process Integration (PI) or Process Orchestration (PO) system for the purposes of...