Agreement regression in phrases like "precio: 2000 pesetas."

[Olga Zamaraeva]

Example 11533 from tbdb03 (and similar):

Precio: 1000 pesetas.

After I made sure that the optcomp-n phrase does not lose agreement information, such phrases no longer parse in any meaningful way because precio is singular and 1000 pesetas is plural. But perhaps for such constructions, something other than a regular subject-head rule should be needed? Theoretically, precio should retain its agreement information and subject-head should ensure agreement, so.

[Olga Zamaraeva]

Fixed with a different treatment of the colon.