Is this Duplicate restraint (or) Ambiguous restraint?

[kumar-physics]

From the example Example NEF/data_1_1/CCPN_2mqq_docr.nef

8 7 . A 373 GLY HAx A 427 TYR HE% 1 . . . . 5.83 .
9 8 . A 373 GLY HAy A 427 TYR HE% 1 . . . . 5.83 .
12 10 . A 373 GLY HAx A 427 TYR HE% 1 . . . . 5.52 .
13 10 . A 373 GLY HAy A 427 TYR HE% 1 . . . . 5.52 .

The above four rows (index:8,9,12,13) refers to the same set of atoms. First two rows they have different restraints id and the last two rows they have the same restraint id and in both case they have different values. Is this an error or does it mean something?. What I understand from here is there is an ambiguous restraint between GLY HAs and TYR HEs, but I don't understand the fine details of why this is expressed in 3(according to restraint IDs) sets of restraints with different distance values.

[rhfogh]

My interpretation would be the following:

7 and 8 are individual restraints; that means that both A 373 GLY HAx and A 373 GLY HAy individually is within 5.83A of A 427 TYR HE%.

10 is an ambiguous restraint; that is telling us that either A 373 GLY HAx or A 373 GLY HAy is within 5.52A of A 427 TYR HE% (but we do not know which one).

Clearly restraints 7-8 and restraint 10 are giving different and non-redundant information.

The additional ambiguity in the identity of the atoms involved is strictly speaking irrelevant. The interpretation would be exactly the same for restraints between on the one hand THR 001 HA and THR 001 HB, and on the other hand VAL 009 HN, Still, I admit that it does not make things easier. HAx and HAy are GLY alpha protons, each identified by its resonance frequency in a given set of conditions; we just do not know how that identity maps to the stereochemistry. 427 TYR HE%, on the other hand, are NMR equivalent, which means that any 'distance' involving them is really calculated from an r-6 sum of distances to the two Tyrosine epsilon protons