BW/4 conversion: Export datasources 8* - can it deleted before the conversion?

[yj]

Hello all,

We just prepare our BW system for the BW/4HANA conversion.

In the Precheck of transaction RSB4HCONV it says that we should migrate our 3.x-datasources - but they are all export datasources, beginning with 8* (e.g. 80PUR_C01 or 80PERS_VAR). Some data of our BW system are transferred to another BW target system.

My question is: I know, that the 8*-datasource are no longer supported in BW/4. Do we really need to migrate them in the preparation phase or can we delete them already now? Are these 8*-datsources necessary to transfer the data from our BW system to the other BW system in BW 7.5? 
What shall we do with these datasources?

Thanks & regards,
Yvonne

[yj]

Just for your information:

To delete export datasource of cubes, the report RSB_CUBE_EXPORT_DS_DELETE can be used (see SAP note 2870936).