In Jenkins->Global Tool Configuration->MSBUILD

I Added a MSBUILD like below

Name: MSBuildTool2017

Path to MSBuild: C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\MSBuild\15.0\Bin\MSBuild.exe

Variable ${tool 'MSBuildTool2017'} can be recognized in one-line batch script but not in the multi-line script, Why?

Is there any way I can void the hardcoded MSBUILd Tool Path in the batch script of Jenkins pipeline script?

def buildSource() { //${tool 'MSBuildTool2017'} is recognized.
 bat "\"${tool 'MSBuildTool2017'}\" ABC.sln /p:Configuration=Release /p:Platform=\"x64\" /t:rebuild"
}

def BuildABC() { //${tool 'MSBuildTool2017'} is not recognized.
 {

bat label: '', script: '''@echo off

set RETVAL=0

echo Navigating to ABC folder
cd %WORKSPACE%
cd project

echo Cleaning up bin folder
REM del bin_x64
*.exe /F /Q /S
REM if NOT "%errorlevel%" == "0" set RETVAL=%errorlevel%

echo Navigating to InstallActionsolution folder
cd ABC

echo Building ABC Binaries
\"${tool 'MSBuildTool2017'}\" "ABC.sln" /p:Configuration=Release /p:Platform=\"x64\" /t:rebuild

if NOT "%errorlevel%" == "0" set RETVAL=%errorlevel%

exit %RETVAL%'''
}