# Limitations


AWS SDK for SAP ABAP includes SDK modules for all AWS services. Some of these modules may have limitations, as described here.
+ Modules that rely on `MQTT` protocol bindings, such as `iotevents`, will not work. `MQTT` is not an HTTP-based protocol and is currently not supported by AWS SDK for SAP ABAP.
+ Operations that return event streams are supported, but will wait until the entire stream is received before returning control to ABAP. Examples are Amazon Bedrock Agents Runtime `InvokeAgent` and AWS Lambda `InvokeWithResponseStream`
+ Operations that receive event streams are not supported due to limitations in the underlying ABAP platform. Examples are Amazon Q Business `Chat` and Amazon Lex `StartConversation`

AWS SDK for SAP ABAP has the following feature limitations.
+ The following Amazon S3 features are not yet supported.
  + Multi-Region access points
  + Amazon S3 client-side encryption

AWS SDK for SAP ABAP - BTP edition has the following limitations during the developer preview.
+ Some modules may not be available.
+ It cannot be uninstalled.
+ It is updated less frequently.