Lots of things to consider here.
The form is continuous and the lookup combo part of the form records (i.e. you see it more than once?) or it is only in the header?
What is the row source for the combo?
AFAIK, LIKE is for text and does not play well with numbers. You should be using other comparison operators such as >=, =, etc. You cannot get 45.00 because it looks "like" 45.25
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.