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Developer-C 11.1
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with need(rn, nid, nq) as ( select 1, 'A', 4 from dual union all select 2, 'B', 2 from dual ), fill(rf, fid, fq) as ( select 1, 'X', 2 from dual union all select 2, 'Y', 4 from dual ), u as ( select rn, nid, -nq nq, null rf, null fid, null fq from need union all select null, null, null, rf, fid, fq from fill), c (crn, cnid, cnq, crf, cfid, cfq, rest, amt) as ( select rn, nid, nq, 0, fid, fq, nq, 0 from u where rn = 1 union all select nvl(rn, crn), nvl(nid, cnid), nvl(nq, cnq), nvl(rf, crf), nvl(fid, cfid), nvl(fq, cfq), rest + nvl(nq, fq), least(abs(rest), abs(nvl(nq, fq))) from c join u on rest >= 0 and rn = crn + 1 or rest < 0 and rf = crf + 1 ) select cnid, cfid, amt from c where amt <> 0
CNID
CFID
AMT
A
X
2
A
Y
2
B
Y
2