Unclear if logic is working for adding lpg route to a subnet route table

[chrisdek11]

Have created a local_peering_gateway and trying to add the LPG_KEY as a routing rule in a subnet route table however getting invalid index in response when running code. Not sure if it is trying to look at entry for lpg route table as opposed to lpg entry in a subnet route table:

local_peering_gateways = {
LPG-KEY = {
display_name = "LPG-VCN"
}

RT-KEY = {
display_name = "RT-VCN"
route_rules = {
lpg-route = {
network_entity_key = "LPG-KEY"
description = "LPG routing"
destination = "x.x.x.x/x"
destination_type = "CIDR_BLOCK"
}
}
}

Error: Invalid index
│
│ on ..\route_tables.tf line 658, in resource "oci_core_route_table" "drga_specific_route_tables":
│ 658: network_entity_id = rule.value.network_entity_id != null ? rule.value.network_entity_id : rule.value.network_entity_key != null ? local.route_rules_targets_for_LPG_specific_RTs[rule.value.network_entity_key].id : null
│ ├────────────────
│ │ local.route_rules_targets_for_LPG_specific_RTs is object with 5 attributes
│ │ rule.value.network_entity_key is "LPG-KEY"
│
│ The given key does not identify an element in this collection value.
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