Run ALTER on a PROCEDURE that is referenced by another object

Question

I’m trying to change/drop the function [xxxx] according to the code.

But the following error returns to me

Msg 3729, Level 16, State 3, Procedure xxxxx, Line 1 [Batch Start Line 15] 
Cannot ALTER 'dbo.xxxxx' because it is being referenced by object 'bbbbb'

By my searches I saw that there is no way to perform a DDL command for scalar functions with the clause 'SCHEMABINDING', another point is that the table in which the SELECT of Function query there is a Constraint.

ALTER FUNCTION [dbo].[xxxxx]
(
    -- Add the parameters for the function here
    @Cliente as nvarchar(100) 
)
RETURNS bigint
WITH SCHEMABINDING
AS
BEGIN

    RETURN (0)

END
GO

OBS: Yes, I want her to return 0.

I would like to know if it is possible to carry out this DROP/ALTER