You receive the error message: Internal session terminated with a runtime error CONVT_NO_NUMBER (see ST22)
PCA, SAP_BASIS_COPY_REFRESH_EXPORT. SAP_BASIS_COPY_REFRESH, CONVT_NO_NUMBER
This error occurs when building the directory name where the export date will be stored on the file system.
Workaround: Reduce the number of background processes to less than 100.