diff --git a/.claude/skills/skd-compile/scripts/skd-compile.ps1 b/.claude/skills/skd-compile/scripts/skd-compile.ps1
index 3724fe8f..607453e3 100644
--- a/.claude/skills/skd-compile/scripts/skd-compile.ps1
+++ b/.claude/skills/skd-compile/scripts/skd-compile.ps1
@@ -1,4 +1,4 @@
-# skd-compile v1.72 — Compile 1C DCS from JSON
+# skd-compile v1.73 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[string]$DefinitionFile,
@@ -1273,6 +1273,9 @@ function Emit-SingleParam {
 		if (Test-EmptyValue $parsed.value) {
 			if (-not $vla) { X "`t`t<value xsi:nil=`"true`"/>" }
 		}
+	} elseif ($parsed.nilValue -eq $true) {
+		# Принудительный xsi:nil даже когда тип известен (для bit-perfect round-trip).
+		if (-not $vla) { X "`t`t<value xsi:nil=`"true`"/>" }
 	} else {
 		Emit-ParamValue -type $parsed.type -val $parsed.value -indent "`t`t" -valueListAllowed $vla
 	}
@@ -1379,6 +1382,7 @@ function Emit-Parameters {
 			if ($p.valueListAllowed -eq $true) { $parsed.valueListAllowed = $true }
 			if ($p.hidden -eq $true) { $parsed.hidden = $true }
 			if ($p.autoDates -eq $true) { $parsed.autoDates = $true }
+			if ($p.nilValue -eq $true) { $parsed.nilValue = $true }
 		}
 
 		# @autoDates implies use=Always + denyIncompleteValues=true by default
diff --git a/.claude/skills/skd-compile/scripts/skd-compile.py b/.claude/skills/skd-compile/scripts/skd-compile.py
index de946438..c1da2583 100644
--- a/.claude/skills/skd-compile/scripts/skd-compile.py
+++ b/.claude/skills/skd-compile/scripts/skd-compile.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# skd-compile v1.72 — Compile 1C DCS from JSON
+# skd-compile v1.73 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 import argparse
 import json
@@ -1086,6 +1086,10 @@ def emit_single_param(lines, p, parsed):
         if is_empty_value(parsed.get('value')):
             if not vla:
                 lines.append('\t\t<value xsi:nil="true"/>')
+    elif parsed.get('nilValue') is True:
+        # Принудительный xsi:nil даже когда тип известен (для bit-perfect round-trip).
+        if not vla:
+            lines.append('\t\t<value xsi:nil="true"/>')
     else:
         emit_param_value(lines, p_type, parsed.get('value'), '\t\t', vla)
 
@@ -1192,6 +1196,8 @@ def emit_parameters(lines, defn):
                 parsed['hidden'] = True
             if p.get('autoDates') is True:
                 parsed['autoDates'] = True
+            if p.get('nilValue') is True:
+                parsed['nilValue'] = True
 
         # @autoDates implies use=Always + denyIncompleteValues=true by default
         # (derived &НачалоПериода/&КонецПериода need a populated period).
diff --git a/.claude/skills/skd-decompile/scripts/skd-decompile.ps1 b/.claude/skills/skd-decompile/scripts/skd-decompile.ps1
index 25d07379..1a002227 100644
--- a/.claude/skills/skd-decompile/scripts/skd-decompile.ps1
+++ b/.claude/skills/skd-decompile/scripts/skd-decompile.ps1
@@ -1,4 +1,4 @@
-# skd-decompile v0.55 — Decompile 1C DCS Template.xml to JSON DSL (draft)
+# skd-decompile v0.56 — Decompile 1C DCS Template.xml to JSON DSL (draft)
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[Parameter(Mandatory)]
@@ -824,6 +824,15 @@ function Render-Parameter {
 	if ($p.expression) { $needsObject = $true }
 	if ($p.notAField) { $needsObject = $true }
 
+	# valueIsNil на non-композитном типе требует object form, чтобы compile
+	# знал что вместо xs:string/xs:decimal-default нужно эмитить xsi:nil="true".
+	# Для ref-типов compile в любом случае эмитит nil, шорткод покрывает.
+	$refTypePattern = '^(Catalog|Document|Enum|ChartOfAccounts|ChartOfCharacteristicTypes|ChartOfCalculationTypes|BusinessProcess|Task|InformationRegister|ExchangePlan|CatalogRef|DocumentRef|EnumRef|ChartOfAccountsRef|ChartOfCharacteristicTypesRef|ChartOfCalculationTypesRef|BusinessProcessRef|TaskRef|InformationRegisterRef|ExchangePlanRef|AnyRef)'
+	$typeIsRef = $false
+	if ($typeShort -is [string] -and $typeShort -match $refTypePattern) { $typeIsRef = $true }
+	$nilNeedsObject = $valueIsNil -and -not $typeIsRef -and $typeShort -and -not ($typeShort -is [array])
+	if ($nilNeedsObject) { $needsObject = $true }
+
 	if (-not $needsObject) {
 		$s = $name
 		if ($title) { $s += " [$title]" }
@@ -837,6 +846,7 @@ function Render-Parameter {
 	if ($title) { $obj['title'] = $title }
 	if ($typeShort) { $obj['type'] = $typeShort }
 	if (-not $valueIsNil -and $null -ne $valueDisplay -and $valueDisplay -ne '') { $obj['value'] = $valueDisplay }
+	if ($nilNeedsObject) { $obj['nilValue'] = $true }
 	if ($p.useAttr -and -not $p.autoDates) { $obj['use'] = $p.useAttr }
 	if ($p.denyIncomplete -and -not $p.autoDates) { $obj['denyIncompleteValues'] = $true }
 	if ($p.hidden) { $obj['hidden'] = $true }