Looking for historic changes of document insertions into SOLAR01

Dear all,

We are documenting our processes in SOLAR01.

Now it happens every now and then, that documents are away.

It seems, that the respective links are deleted (fortunately, not the documents itself).

I'm looking for the history of document assignments to SOLAR01, to see if & when document links have been deleted.

It is not shown in the document properties itself.

Anyone here, who knows where to look to see the historic changes of document insertions into SOLAR01??

Thanks,

Jan