Synonym dbxrefs are not being displayed

[cooperl09]

In the plant structure development stage (PO:0009012) branch of the PO we have a large number of mappings from our stage terms to terms in other ontologies and vocabularies.
The corresponding mappings (eg GRO:ID) do not show up in the browser and you cannot search for them.

For example:
[Term]
id: PO:0007022
name: seed imbibition stage
namespace: plant_structure_development_stage
def: "A seed germination stage (PO:0007057) during which there is absorption of water by the seed (PO:0009010)." [Gramene:Anuradha_Pujar, ISBN:0306416875, POC:Laurel_cooper]
synonym: "0.1 imbibition in maize (related)" RELATED [MaizeGDB:64054]
synonym: "01 Beginning of seed imbibition in soybean (related)" RELATED [SOY:0000090]
synonym: "03 Seed imbibition complete in soybean (related)" RELATED [SOY:0000091]
synonym: "1.02-start of imbibition in barley (related)" RELATED [GRO:0007053]
synonym: "1.02-start of imbibition in oat (related)" RELATED [GRO:0007053]
synonym: "1.02-start of imbibition in Triticeae (related)" RELATED [GRO:0007053]
synonym: "1.02-start of imbibition in wheat (related)" RELATED [GRO:0007053]
synonym: "1.03-imbibition complete in barley (related)" RELATED [GRO:0007054]
synonym: "1.03-imbibition complete in oat (related)" RELATED [GRO:0007054]
synonym: "1.03-imbibition complete in Tricticeae (related)" RELATED [GRO:0007054]
synonym: "1.03-imbibition complete in wheat (related)" RELATED [GRO:0007054]
synonym: "BBCH growth stage 01 (related)" RELATED [ISBN:3826331524]
synonym: "imbibition in Arabidopsis (related)" RELATED [TAIR:0000394]
synonym: "imbibition in Solanaceae (related)" RELATED [SGN:0000004]
xref: PO_GIT:366
xref: PO_GIT:595
is_a: PO:0007057 ! seed germination stage

Is there a way to display these in the Planteome browser?

[cmungall]

The solution outlined for synonym scopes/types here:

geneontology#290 (comment)

will also work for xrefs on synonyms