Spanish to English Bus/Financial Business/Commerce (general) bids for supply of services

Distribución en anualidades del gasto derivado del contrato:
Año 20 xxxxxx Euros
La baja ofertada por el adjudicatario se considerará repercutida proporcionalmente en todas las anualidades a que se extienda la ejecución del contrato.

The term "Baja" seems to be used in so many differnt ways and has so many different translations in English! The document is on the specifications governing bids for the supply of services, but I do not know what this "baja" refers to. In this case I have very little context to work with; after this phrase comes another heading, unrelated to this text.