You need to adapt the path data in the files <client>_CTK.xml and <DATASOURCE>.xml so that they match the new directory structure (see chapter Transfer customizing directory without changes).
Procedure
Switch to the <PPM99_DATA>/custom/<client>/xml directory.
Edit the file <client>_CTK.xml using a text editor and adjust the paths contained. Make sure that you use relative paths and / as separators between the individual path parts. The home directory is now <PPM99_CLIENT_RUN>/bin. This means that you need to replace ../ by ../../../../../work/data_ppm/.
To continue using the data sources you need to adapt the data source files. Proceed as follows for each data source.
Switch to the <PPM99_DATA>/custom/<client>/xml/<DATASOURCE> directory.
Edit the file <DATASOURCE>.xml using a text editor and adjust the paths contained. Make sure that you use relative paths and / as separators between the individual path parts. The home directory is now <PPM99_CLIENT_RUN>/bin. This means that you need to replace ../ by ../../../../../work/data_ppm/.