Depends what option you are under :
- under options A and B, very little if any additional risk apart from the Project Manager not having the chance today "I am aware that they did not perform that well on another project" which might give you second thoughts about using them. Having said that, the PM could instruct you to stop until he or she has accepted them which, while a compensation event, would arise from your fault so zero assessment;
- under options C to F, as above and any ADDITIONAL cost incurred as a result would be a Disallowed Cost if you haven't followed a procurement procedure in the Works Information. There may be other reasons as well within the Disallowed Cost clauses.
- under options A and B, very little if any additional risk apart from the Project Manager not having the chance today "I am aware that they did not perform that well on another project" which might give you second thoughts about using them. Having said that, the PM could instruct you to stop until he or she has accepted them which, while a compensation event, would arise from your fault so zero assessment;
- under options C to F, as above and any ADDITIONAL cost incurred as a result would be a Disallowed Cost if you haven't followed a procurement procedure in the Works Information. There may be other reasons as well within the Disallowed Cost clauses.