Hello Forum, I have an issue in Moving items between Two multi select dropdown b

I have gone through your code and I would like to put forward a simple approach in the form of a pseudocode and if you implement these steps, the underlying complexity in the code comes down and will be much easier to debug, maintain and in-fact the issue will be resolved:

- Maintain a master copy of the data present in local!availableCountries, say local!availableCountries_master. Please don't make any modifications in this variable as this will be solely used as reference for addition and removals in the Available and Global Countries data.
          local!availableCountries_master: index(local!regProjectCountries,wherecontains(local!availableCountryEREFs,local!regProjectCountries.REGION_EREF),
- Maintain two separate variables namely local!availableCountries and local!globalActionCountries. Initialise these variables in load() as follows:
          local!availableCountries:local!availableCountries_master, /*should be available to Available Countries*/
          local!globalActionCountries: null, /*should be available to Global Action Countries*/
- Perform addition or removal operations on local!availableCountries and local!globalActionCountries with reference to local!availableCountries_master as follows:

a. Add All:
          - Empty local!availableCountries.
          - Populate local!globalActionCountries with local!availableCountries_master.
b. Remove All:
          - Populate local!availableCountries with local!availableCountries_master.
          - Empty local!globalActionCountries.
c. Select and add:
          - Update local!availableCountries with remove(local!availableCountries, selectedIndices)
          - Update local!globalActionCountries with local!availableCountries_master by removing the values of local!availableCountries.
d. Select and remove:
          - Update local!globalActionCountries with remove(local!globalActionCountries, selectedIndices)
- Update local!availableCountries with local!availableCountries_master by removing the values of local!globalActionCountries.
          
While implementing the above approach, please do ensure that you are handling null values in the usage of set functions, value of a SAIL component etc.

Please do let me know if you have any questions. Else I can help you in transforming the above steps into actual code.

I have gone through your code and I would like to put forward a simple approach in the form of a pseudocode and if you implement these steps, the underlying complexity in the code comes down and will be much easier to debug, maintain and in-fact the issue will be resolved:

- Maintain a master copy of the data present in local!availableCountries, say local!availableCountries_master. Please don't make any modifications in this variable as this will be solely used as reference for addition and removals in the Available and Global Countries data.
          local!availableCountries_master: index(local!regProjectCountries,wherecontains(local!availableCountryEREFs,local!regProjectCountries.REGION_EREF),
- Maintain two separate variables namely local!availableCountries and local!globalActionCountries. Initialise these variables in load() as follows:
          local!availableCountries:local!availableCountries_master, /*should be available to Available Countries*/
          local!globalActionCountries: null, /*should be available to Global Action Countries*/
- Perform addition or removal operations on local!availableCountries and local!globalActionCountries with reference to local!availableCountries_master as follows:

a. Add All:
          - Empty local!availableCountries.
          - Populate local!globalActionCountries with local!availableCountries_master.
b. Remove All:
          - Populate local!availableCountries with local!availableCountries_master.
          - Empty local!globalActionCountries.
c. Select and add:
          - Update local!availableCountries with remove(local!availableCountries, selectedIndices)
          - Update local!globalActionCountries with local!availableCountries_master by removing the values of local!availableCountries.
d. Select and remove:
          - Update local!globalActionCountries with remove(local!globalActionCountries, selectedIndices)
- Update local!availableCountries with local!availableCountries_master by removing the values of local!globalActionCountries.
          
While implementing the above approach, please do ensure that you are handling null values in the usage of set functions, value of a SAIL component etc.

Please do let me know if you have any questions. Else I can help you in transforming the above steps into actual code.