Why sign validation is failing for XML file in ASP.NET with C#?

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signature

I am signing an xml file using RSA Algortithm but on validation the same fails if the tag format changes.

Signing validation is failing with below format. Getting Malformed element Signature as error

<?xml version="1.0" encoding="UTF-8"?>
<psys:request xmlns:psys="urn:iso:std:psys:request" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <id>BNZW0M00000DW</id>
  <type>CR</type>
  <format>MT</format>
  <date>2017-04-26T12:21:13</date>
  <signature>mjd3+FRjmVksvkZIEQZtqjtabgX6pgZvAd5uSgt6WQIm/jJX9stO5RN//MzMegso7VvkfuOW9haS+gnHabG+eqWyMfU5CBSy24uVKoBt3l8GYvvxrIY2+q2K8UAATZaBXZvP9mDHuWWuDFfL5PE1wrhqaVBP8FUv2/9TMf6mhWo=</signature>
     <content>
        <![CDATA[{1:F01BNZWOMRXA0011111000000}{2:I102ACHMOMRXA001N}{3:{:113:0100}}{4:
:20:BNZW0M00000DW
:23:CREDIT
:26T:19
:21:BNZW0M00000DW001
:32B:OMR111,
:50K:/123124124
test
:52A:BNZWOMRXA001
:57A:BDOFOMRUA001
:59:/1231234124
test2
:70:
:77B:234234
1
1
:71A:SHA
:32A:170426OMR111,
-}]]>
      </content>
  <content>
    <![CDATA[{1:F01BNZWOMRXA0011111000000}{2:I102ACHMOMRXA001N}{3:{:113:0100}}{4:
:20:BNZW0M00000DW
:23:CREDIT
:26T:19
:21:BNZW0M00000DW001
:32B:OMR111,
:50K:/123124124
test
:52A:BNZWOMRXA001
:57A:BDOFOMRUA001
:59:/1231234124
test2
:70:
:77B:234234
1
1
:71A:SHA
:32A:170426OMR111,
-}]]>
  </content>
 </psys:request>

What I have tried:

Signing and validation was done as per below link:
How to: Sign XML Documents with Digital Signatures[^]