This way I found the leck: I update a patch on a file svn-repo and misstyped his path to the fullpath to ESVN_STORE_DIR. The patched file was in ESVN_STORE_DIR and not only inside the WORKDIR. I tested this more and found that not only files ESVN_STORE_DIR (I think addwrite "${ESVN_STORE_DIR}" should enable the possibility to fetch the source) but everywhere.