Upload documents to an asset master data

Dear Sir or Madam,

in the transactions AS01 and AS02 its exist the possibility under "services for object" to upload original documents

to the master data of the asset. We use currently already this function and we want to make a reorganisation of the asset master data.

Where are this documents stored in SAP? Are these documents sure when we reorganize our data?

Many thanks in advance for your help!

Axel Krächan