One quick solution is as follows:
SELECT childid, parentid, checkdate, docid, sum(cast(fixed_length as dec(10,2)) as sumfixedlength
from (
SELECT
dbo.Erika_test_claim_billed.childid,
dbo.Erika_test_claim_billed.parentid,
dbo.Erika_test_claim_billed.checkdate,
dbo.Erika_test_claim_billed.docid,
dbo.padfieldleft(case
when (dbo.Erika_test_adjustments.seq = 1 or
dbo.Erika_test_adjustments.seq is null)...