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Hi Russell,

I always come here to post my questions, before I go to Slack, because answers in Slack are not easily found by others. :-)   In this case, I though this post didn't go ahead, because I was getting an error when posting, so I went to Slack instead.

Meanwhile, looking at the source code of RelatedAssetsInfoCollectionProvider.java, I got the answer I really needed. 

While Vitaly's answer is quite usable, if you're working in Java you can use the API to find the assetId with this code:

	private long _getLayoutAssetEntryId() {
		ServiceContext serviceContext =
			ServiceContextThreadLocal.getServiceContext();

		HttpServletRequest httpServletRequest = serviceContext.getRequest();

		AssetEntry layoutAssetEntry =
			(AssetEntry)httpServletRequest.getAttribute(
				WebKeys.LAYOUT_ASSET_ENTRY);

		if (layoutAssetEntry != null) {
			return layoutAssetEntry.getEntryId();
		}

		return 0;
	}

Fernando

Great! Glad you got it solved in an even more robust way.