Hello Venkata,
I've checked in standard structures, there is no standard mapping for vendor's fields Street 4 and Street 5 in structures FPAYH, FPAYHX and FPAYP. However, that's is not a big issue. In such cases, when SAP doesn't provide standard mapping, we can configure it via user-exit. Please get in touch with your developer and discuss this topic. If you need any further input, please let me know.
B.R
The Wirtschaftsmann