When is the supplementary oath to evidence prescribed in commercial lawsuits?

The supplementary oath to evidence is prescribed in commercial lawsuits when the position of one of the litigants is strengthened by the existence of incomplete evidence. This oath serves to strengthen that deficient evidence. The judge may offer it to the party whose position has been strengthened to complete the proof of their claim, such as swearing to the validity of the completion of what was agreed upon in purchase orders or the validity of the submitted documents.