dbt cannot create two resources with identical database representations

I have a situation here as below:

There are two models in my dbt project

1. model-A

{{ config(
    materialized='ephemeral',
    alias='A_0001',
    schema=var('xxx_yyy_dataset')
) }}

2. model-B

{{ config(
    materialized='ephemeral',
    alias='B_0002',
    schema=var('xxx_yyy_dataset')
) }}

And these are getting materialized as incremental in same schema as xxx_yyy_dataset.Table_DDD

{{ config(
    materialized='incremental',
    alias='Table_DDD',
    schema=var('xxx_yyy_dataset')
) }}
SELECT * FROM {{ref('A_0001')}}
UNION ALL
SELECT * FROM {{ref('B_0002')}}

This is working fine and it is ingesting records into target table.

Now I have introduced another model - model-C ind different package model-C

{{ config(
    materialized='incremental',
    alias='Table_DDD',
    schema=var('xxx_yyy_dataset')
) }}

This gives me the following error:

$ dbt compile --profiles-dir=profile --target ide
Running with dbt=0.16.0
Encountered an error:
Compilation Error
  dbt found two resources with the database representation "xxx_yyy_dataset.Table_DDD".
  dbt cannot create two resources with identical database representations. To fix this,
  change the "schema" or "alias" configuration of one of these resources:
  - model.eplus_rnc_dbt_project.conrol_outcome_joined (models/controls/payment/fa-join/conrol_outcome_joined.sql)
  - model.eplus_rnc_dbt_project.dq_control_outcome_joined (models/controls/dq/dq-join/dq_control_outcome_joined.sql)

I have configured macro for custom macro as below :

{% macro generate_schema_name(custom_schema_name, node) -%}
    {%- set default_schema = target.schema -%}
    {%- if custom_schema_name is none -%}
        {{ default_schema }}
    {%- else -%}
        {{ custom_schema_name }}
    {%- endif -%}
{%- endmacro %}


{% macro generate_alias_name(custom_alias_name=none, node=none) -%}
    {%- if custom_alias_name is none -%}
        {{ node.name }}
    {%- else -%}
        {{ custom_alias_name | trim }}
    enter code here
    {%- endif -%}
{%- endmacro %}