"Invoice history is completely missing at all – there is no traceability of actions that have been taken on the contract; at least following steps should be logged:
1. Who has created when the contract document
2. Who has activated when the contract document
3. Who has modified when settings on the contract document
4. Who has created (or modified) when the invoice plan
5. When was invoice connected to invoice plan"

issue of ICS compliance - traceability of a document like agreement should be given as for an invoice document. Essential entries or changes on the document which are crucial for the document handling, the contract invoice handling and accounting relevant settings should be tracked.