Here is a freebie....
Try this version of the function to see if it helps / makes a difference
create function [dbo].[CheckDigit](@vol varchar(50))
returns table
with schemabinding
as
return
select
case isnumeric(base.vol)
when 1
then
case sum(c.digit) % 11
when 0 then 1
when 1 then 0
else 11 - sum(c.digit) % 11
end
else 0
end as CheckDigit
from (select replace(@vol,'.','')) base(vol)
outer apply (
select top(datalength(vol)) M*cast(substring(base.vol,N,1) as int)
from (values(1,3),(2,7),(3,1),(4,3),(5,7),(6,1),(7,3),(8,7),(9,1),(10,3),(11,7),(12,1),(13,3),(14,7),(15,1),(16,3),(17,7),(18,1),(19,3),(20,7),(21,1),(22,3),(23,7),(24,1),(25,3),(26,7),(27,1),(28,3),(29,7),(30,1),(31,3),(32,7),(33,1),(34,3),(35,7),(36,1),(37,3),(38,7),(39,1),(40,3),(41,7),(42,1),(43,3),(44,7),(45,1),(46,3),(47,7),(48,1),(49,3),(50,7)) x(N,M)
) c(digit)
group by base.vol
MM
select geometry::STGeomFromWKB(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