English translation: availability of supplies and raw materials
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Explanation: It means that your supplier is dependent on the deliveries made by its sub-contractors. You can't make a car if you haven't been supplied with the parts, and if you receive the parts late, you will have to deliver the car late.
In a real-life job (which is archived in my TM in DejaVuX), I translated the source sentence:
"Alle vereinbarten Lieferfristen gelten vorbehaltlich richtiger und rechtzeitiger Selbstbelieferung."
"All delivery periods agreed shall be conditional on correct and punctual availability of supplies and raw materials."