Rendering image from a different data set

Hi

I followed the instructions described in this document to render an image.

https://docs.oracle.com/middleware/12211/bip/BIPRD/GUID-58D7E662-146A-44AA-86F9-111E2C6DB3A5.htm#BIPRD2397

The syntax

<fo:instream-foreign-object content-type="image/jpg">

<xsl:value-of select="IMAGE_ELEMENT"/>

</fo:instream-foreign-object>

Seems to refer to the main data set.

How can I use an BLOB from a different data set?

I tried

<fo:instream-foreign-object content-type="image/jpg">

<xsl:value-of select="./G_14/IMAGE_ELEMENT"/>

</fo:instream-foreign-object>

but the report didn't generate.

I tried different variance of the syntaxt for example

<fo:instream-foreign-object content-type="image/jpg