JP-2108 Asn_Lv2NRSLAMPSpectral: Allow msaspec only if msametfl is ava…

…ilable. (#6085)

* Asn_Lv2NRSLAMPSpectral: Allow msaspec only if msametfl is available.

* update changelog

* update changelog again [skip ci]

CHANGES.rst

@@ -1,6 +1,11 @@
 1.2.1 (unreleased)
 ==================
 
+associations
+------------
+
+- Asn_Lv2NRSLAMPSpectral: Allow msaspec only if msametfl is available. [#6085]
+
 combine_1d
 ----------
 
@@ -53,6 +58,8 @@ assign_wcs
 associations
 ------------
 
+- Asn_Lv2NRSLAMPSpectral: Allow msaspec only if msametfl is available. [#6085]
+
 - Add rule Asn_MIRMRSBackground to treat background as science. [#6046]
 
 - Updated level2b WFSS rules to only consider exposures from the same

jwst/associations/lib/rules_level2b.py

@@ -507,9 +507,29 @@ def __init__(self, *args, **kwargs):
                 sources=['filter'],
                 value='opaque'
             ),
-            DMSAttrConstraint(
-                name='opmode',
-                sources=['opmode'],
+            Constraint(
+                [
+                    Constraint(
+                        [DMSAttrConstraint(
+                            name='opmode',
+                            sources=['opmode'],
+                            value='msaspec',
+                        )],
+                        reduce=Constraint.notany
+                    ),
+                    Constraint(
+                        [
+                            DMSAttrConstraint(
+                                sources=['opmode'],
+                                value='msaspec'
+                            ),
+                            DMSAttrConstraint(
+                                sources=['msametfl']
+                            )
+                        ]
+                    ),
+                ],
+                reduce=Constraint.any
             ),
             DMSAttrConstraint(
                 name='lamp',