---
alias: user-guide-business-workflow-task-manage-protocol-instance-materials
render_macros: false
description: "Associates and disassociates explicitly selected materials with one exception protocol instance through the service."
---

# Manage Protocol Instance Materials

Associates and disassociates explicitly selected **Materials** with one exception **Protocol Instance** through the service.

![Screenshot of a Business Workflow managing Materials and comments on an open Protocol Instance.](images/business-workflow-task-manage-protocol-instance-materials.png)

## Inputs

Set `ProtocolInstance`, `MaterialsToAdd`, `MaterialsToRemove`, `MaterialsForComments`, `Comment` in the task details. Use the value editor to select compatible results from earlier tasks.

## Outputs

Use `ProtocolInstance`, `Added`, `Removed`, `Message` in subsequent tasks.

??? example "Manage Protocol Instance Materials"

    Connect an open **Protocol Instance** and the **Materials** to add or remove. Enter one `Comment`; select `MaterialsForComments` to annotate existing relations, or leave it unset to annotate the additions. Use a loop for different comments per **Material**.

## Behavior

Leave `MaterialsForComments` unset to apply `Comment` to the additions. Select existing related materials to update their comments. Leave `Comment` unset to preserve comments. Use **For each** when different materials require different comments.