Error - "You can't update the field on a record that has related Contact Point Address" when copying HCP addresses

Work through the cause that matches your symptom.

Cause 1: "You can't update the field on a record that has related Contact Point Address" when the flow clones HCP/HCO addresses, especially with two Person Account record types enabled (KI-20001).
1. Open Setup > Flows and locate the flow that invokes the [Process Contact Point Address Records] action.
2. In the flow, after opening it, re-select the Person Account field references in the assignment/update elements, then save the flow again. This re-binds the field references that break when two Person Account record types exist.
3. If you are deploying this flow rather than editing in place, edit the Person Account field references directly in the flow Metadata, then deploy.
4. Confirm the [Process Contact Point Address Records] action only sets fields on the new (cloned) [ContactPointAddress] record and does not attempt to update locked parent fields on the existing record.

Cause 2: Record creation fails from the Search Before Create component when the related Contact Point Address field is populated, often for non-admin users (KI-69017 pattern).
1. Go to Setup > Profiles or Setup > Permission Sets for the affected users.
2. Under Object Settings > Contact Point Address [ContactPointAddress], set Read and Edit to enabled.
3. Under Field-Level Security, set [Field Permissions] for the address fields used by the component (including Billing/Shipping Address fields on related objects) to Visible = checked and Read-Only = unchecked.
4. Reassign the permission set or re-save the profile, then have the user log out and back in.

Cause 3: "Attempt to de-reference a null object" when downloading the account list.
1. Identify the formula field or trigger handler referenced during the download. In Life Sciences Cloud sample-limit setups this is the custom formula field mapping the sample limit template API name and the [NewAccountSampleLimitInitHandler] / [NewAccountSampleLimitInitHandlerforHCO] trigger handlers.
2. Open Setup > Object Manager > Account > Fields & Relationships and confirm the custom formula field returns a non-null value (wrap the mapping in a null-safe formula such as BLANKVALUE or IF(ISBLANK(...),"",...)).
3. Verify the Account records being downloaded have the related [ContactPointAddress] populated; null related records cause the de-reference error.

Cause 4: "We couldn't perform the action because there are unprocessed sync transactions. Try again later or ask your Salesforce admin for help" when unlocking a Visit with sample disbursement or DTP order records.
1. Go to Setup > Object Manager and review the sync transaction object tied to the Visit.
2. Confirm there are no records in a Pending or Failed sync state for that Visit; reprocess or clear any stuck transactions before retrying the unlock.
3. If no pending transactions exist, this matches a known row-lock condition (KI-20078 / KI-20001 reference resolution patterns); retry the unlock after sync processing completes.

Confirm the issue is resolved by re-running the HCP contact point address copy flow and verifying a cloned [ContactPointAddress] record is created without the "You can't update the field" error, by creating an account from Search Before Create with the related Contact Point Address populated, by downloading the account list without the de-reference error, and by unlocking a Visit with sample disbursement records successfully.